[sumac] fix: allow user provided value if can auto-create orgs [FC-0076]

[pomegranited]

Description

Backports #1582 to Sumac.

Supporting information

• Part of: Create Library: Organization dropdown behavior is incorrect #1577
• Depends on: [sumac] fix: allow_to_create_new_org checks org autocreate [FC-0076] edx-platform#36288
• Private-ref: FAL-4089

Testing instructions

1. Ensure you're running [sumac] fix: allow_to_create_new_org checks org autocreate [FC-0076] edx-platform#36288 in your sumac dev stack.
2. See fix: allow user provided value if can auto-create orgs [FC-0076] #1582 for testing instructions.

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Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                     Coverage Diff                      @@
##             open-release/sumac.master    #1678   +/-   ##
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  Coverage                             ?   93.23%           
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  Files                                ?     1050           
  Lines                                ?    20427           
  Branches                             ?     4297           
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  Hits                                 ?    19046           
  Misses                               ?     1324           
  Partials                             ?       57           

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