fix: added more amplify js v6 unit tests fixed a bug

[letsbelopez]

Problem

We needed more unit test coverage of amplify js v6 api updates.

Solution

Added custom primary key and many to many model tests. It found one bug and the fix is part of the commit to get the tests passing.

Additional Notes

Links

Ticket

GitHub issue:

Other links

Verification

Manual tests

Automated tests

• Unit tests added/updated
• E2E tests added/updated
• N/A - (provide a reason)
• deferred - (provide GitHub issue for tracking)

Housekeeping

• No non-essential console logs
• All new files contain license notice

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #1102 (067d6d0) into main (acae93c) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main    #1102   +/-   ##
=======================================
  Coverage   94.00%   94.00%           
=======================================
  Files         125      125           
  Lines        5957     5957           
  Branches     1822     1822           
=======================================
  Hits         5600     5600           
  Misses        339      339           
  Partials       18       18           

Files	Coverage Δ
...act/lib/forms/form-renderer-helper/relationship.ts	93.15% <ø> (ø)

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