Added dialogflow_agent_to_link field to the google_discovery_engine_chat_engine resource

[averbuks]

Added chat_engine_config.dialogflow_agent_to_link field to the google_discovery_engine_chat_engine resource.
Field exists in the API and allows users to make use of an existing DialogFlow Agent (for ex. deployed by terraform), hence agent management can be done by terraform, including security settings, page configurations and many more.

Also fixes hashicorp/terraform-provider-google#19678

Release Note Template for Downstream PRs (will be copied)

discoveryengine: added `chat_engine_config.dialogflow_agent_to_link` field to `google_discovery_engine_chat_engine` resource

[github-actions]

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@c2thorn, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 3 files changed, 144 insertions(+), 6 deletions(-))
google-beta provider: Diff ( 3 files changed, 144 insertions(+), 6 deletions(-))
terraform-google-conversion: Diff ( 1 file changed, 11 insertions(+))
Open in Cloud Shell: Diff ( 4 files changed, 131 insertions(+))

[modular-magician]

Tests analytics

Total tests: 13
Passed tests: 11
Skipped tests: 0
Affected tests: 2

Click here to see the affected service packages

• discoveryengine

Action taken

Found 2 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccDiscoveryEngineChatEngine_discoveryengineChatEngineExistingDialogflowAgentExample
• TestAccDiscoveryEngineChatEngine_discoveryengineChatengine_update

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccDiscoveryEngineChatEngine_discoveryengineChatEngineExistingDialogflowAgentExample[Debug log]
TestAccDiscoveryEngineChatEngine_discoveryengineChatengine_update[Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

---

🟢 All tests passed!

View the build log or the debug log for each test

[c2thorn]

why are we adding ignore_read to this one here? Did it not correctly read before?

[averbuks]

ignore_read is set on the parent field here

magic-modules/mmv1/products/discoveryengine/ChatEngine.yaml

Line 126 in bbf9f40

ignore_read: true

So I decided to repeat it for both nested fields to have it set more explicit in the code, but you are right, it can be removed since parent field has it set already

[c2thorn]

thanks for the context