Adding resource aws_ssoadmin_account_assignments

[mattrobinsonsre]

Superseded by #23292

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Closes #18739

Output from acceptance testing:

$ make testacc PKG=ssoadmin
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ssoadmin/... -v -count 1 -parallel 20   -timeout 180m
=== RUN   TestAccSSOAdminAccountAssignment_Basic_group
=== PAUSE TestAccSSOAdminAccountAssignment_Basic_group
=== RUN   TestAccSSOAdminAccountAssignment_Basic_user
=== PAUSE TestAccSSOAdminAccountAssignment_Basic_user
=== RUN   TestAccSSOAdminAccountAssignment_disappears
=== PAUSE TestAccSSOAdminAccountAssignment_disappears
=== RUN   TestAccSSOAdminAccountAssignments_Basic_group
=== PAUSE TestAccSSOAdminAccountAssignments_Basic_group
=== RUN   TestAccSSOAdminAccountAssignments_Basic_user
=== PAUSE TestAccSSOAdminAccountAssignments_Basic_user
=== RUN   TestAccSSOAdminInstancesDataSource_basic
=== PAUSE TestAccSSOAdminInstancesDataSource_basic
=== RUN   TestAccSSOAdminManagedPolicyAttachment_basic
=== PAUSE TestAccSSOAdminManagedPolicyAttachment_basic
=== RUN   TestAccSSOAdminManagedPolicyAttachment_forceNew
=== PAUSE TestAccSSOAdminManagedPolicyAttachment_forceNew
=== RUN   TestAccSSOAdminManagedPolicyAttachment_disappears
--- PASS: TestAccSSOAdminManagedPolicyAttachment_disappears (27.91s)
=== RUN   TestAccSSOAdminManagedPolicyAttachment_Disappears_permissionSet
--- PASS: TestAccSSOAdminManagedPolicyAttachment_Disappears_permissionSet (18.53s)
=== RUN   TestAccSSOAdminManagedPolicyAttachment_multipleManagedPolicies
=== PAUSE TestAccSSOAdminManagedPolicyAttachment_multipleManagedPolicies
=== RUN   TestAccSSOAdminPermissionSetDataSource_arn
=== PAUSE TestAccSSOAdminPermissionSetDataSource_arn
=== RUN   TestAccSSOAdminPermissionSetDataSource_name
=== PAUSE TestAccSSOAdminPermissionSetDataSource_name
=== RUN   TestAccSSOAdminPermissionSetDataSource_nonExistent
=== PAUSE TestAccSSOAdminPermissionSetDataSource_nonExistent
=== RUN   TestAccSSOAdminPermissionSetInlinePolicy_basic
=== PAUSE TestAccSSOAdminPermissionSetInlinePolicy_basic
=== RUN   TestAccSSOAdminPermissionSetInlinePolicy_update
=== PAUSE TestAccSSOAdminPermissionSetInlinePolicy_update
=== RUN   TestAccSSOAdminPermissionSetInlinePolicy_disappears
--- PASS: TestAccSSOAdminPermissionSetInlinePolicy_disappears (20.30s)
=== RUN   TestAccSSOAdminPermissionSetInlinePolicy_Disappears_permissionSet
--- PASS: TestAccSSOAdminPermissionSetInlinePolicy_Disappears_permissionSet (20.05s)
=== RUN   TestAccSSOAdminPermissionSet_basic
=== PAUSE TestAccSSOAdminPermissionSet_basic
=== RUN   TestAccSSOAdminPermissionSet_tags
--- PASS: TestAccSSOAdminPermissionSet_tags (55.21s)
=== RUN   TestAccSSOAdminPermissionSet_updateDescription
=== PAUSE TestAccSSOAdminPermissionSet_updateDescription
=== RUN   TestAccSSOAdminPermissionSet_updateRelayState
=== PAUSE TestAccSSOAdminPermissionSet_updateRelayState
=== RUN   TestAccSSOAdminPermissionSet_updateSessionDuration
=== PAUSE TestAccSSOAdminPermissionSet_updateSessionDuration
=== RUN   TestAccSSOAdminPermissionSet_RelayState_updateSessionDuration
=== PAUSE TestAccSSOAdminPermissionSet_RelayState_updateSessionDuration
=== RUN   TestAccSSOAdminPermissionSet_mixedPolicyAttachments
=== PAUSE TestAccSSOAdminPermissionSet_mixedPolicyAttachments
=== CONT  TestAccSSOAdminAccountAssignment_Basic_group
=== CONT  TestAccSSOAdminPermissionSetDataSource_nonExistent
=== CONT  TestAccSSOAdminPermissionSet_updateRelayState
=== CONT  TestAccSSOAdminPermissionSet_basic
=== CONT  TestAccSSOAdminPermissionSet_updateDescription
=== CONT  TestAccSSOAdminManagedPolicyAttachment_basic
=== CONT  TestAccSSOAdminPermissionSetDataSource_arn
=== CONT  TestAccSSOAdminAccountAssignment_disappears
=== CONT  TestAccSSOAdminAccountAssignments_Basic_group
=== CONT  TestAccSSOAdminPermissionSetInlinePolicy_update
=== CONT  TestAccSSOAdminManagedPolicyAttachment_multipleManagedPolicies
=== CONT  TestAccSSOAdminAccountAssignment_Basic_user
=== CONT  TestAccSSOAdminPermissionSetDataSource_name
=== CONT  TestAccSSOAdminPermissionSetInlinePolicy_basic
=== CONT  TestAccSSOAdminPermissionSet_mixedPolicyAttachments
=== CONT  TestAccSSOAdminManagedPolicyAttachment_forceNew
=== CONT  TestAccSSOAdminPermissionSet_updateSessionDuration
=== CONT  TestAccSSOAdminAccountAssignments_Basic_user
=== CONT  TestAccSSOAdminPermissionSet_RelayState_updateSessionDuration
=== CONT  TestAccSSOAdminInstancesDataSource_basic
--- PASS: TestAccSSOAdminPermissionSetDataSource_nonExistent (10.53s)
--- PASS: TestAccSSOAdminInstancesDataSource_basic (22.39s)
--- PASS: TestAccSSOAdminPermissionSetDataSource_arn (30.25s)
--- PASS: TestAccSSOAdminPermissionSet_basic (33.43s)
--- PASS: TestAccSSOAdminAccountAssignment_disappears (41.19s)
--- PASS: TestAccSSOAdminPermissionSetDataSource_name (43.32s)
--- PASS: TestAccSSOAdminPermissionSetInlinePolicy_basic (43.53s)
--- PASS: TestAccSSOAdminAccountAssignments_Basic_group (46.83s)
--- PASS: TestAccSSOAdminAccountAssignment_Basic_user (47.01s)
--- PASS: TestAccSSOAdminManagedPolicyAttachment_basic (50.46s)
--- PASS: TestAccSSOAdminPermissionSet_updateSessionDuration (54.33s)
--- PASS: TestAccSSOAdminPermissionSet_updateDescription (54.34s)
--- PASS: TestAccSSOAdminPermissionSet_updateRelayState (54.41s)
--- PASS: TestAccSSOAdminPermissionSet_RelayState_updateSessionDuration (54.94s)
--- PASS: TestAccSSOAdminPermissionSetInlinePolicy_update (60.59s)
--- PASS: TestAccSSOAdminPermissionSet_mixedPolicyAttachments (61.51s)
--- PASS: TestAccSSOAdminManagedPolicyAttachment_forceNew (70.69s)
--- PASS: TestAccSSOAdminAccountAssignment_Basic_group (76.75s)
--- PASS: TestAccSSOAdminAccountAssignments_Basic_user (76.81s)
--- PASS: TestAccSSOAdminManagedPolicyAttachment_multipleManagedPolicies (91.68s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ssoadmin	237.127s

[mattrobinsonsre]

Implementation of this resource in place of multiple aws_ssoadmin_account_assignment incantations reduces the plan time for our infra from ~20 minutes to ~2 minutes.

[mattrobinsonsre]

We've been using this without issue on our own infra now for 3 weeks. It gets several updates per week.

[github-actions]

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