chore: adding relational snapshot tests for non-id primary keys

[alharris-at]

Description of changes

CDK / CloudFormation Parameters Changed

Issue #, if available

Description of how you validated changes

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)
• New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies
• Any CDK or CloudFormation parameter changes are called out explicitly

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #1307 (9b886fc) into main (63da24a) will increase coverage by 0.08%.
The diff coverage is 88.40%.

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@@            Coverage Diff             @@
##             main    #1307      +/-   ##
==========================================
+ Coverage   63.56%   63.64%   +0.08%     
==========================================
  Files         295      297       +2     
  Lines       18573    18616      +43     
  Branches     4487     4487              
==========================================
+ Hits        11805    11848      +43     
+ Misses       6150     6148       -2     
- Partials      618      620       +2     

Impacted Files	Coverage Δ
...graphql-transformer/transform-graphql-schema-v1.ts	8.96% <ø> (ø)
...graphql-transformer/transform-graphql-schema-v2.ts	19.41% <0.00%> (ø)
.../src/graphql-transformer/transformer-options-v2.ts	14.76% <ø> (ø)
...ry-api/src/provider-utils/supported-datasources.ts	100.00% <ø> (ø)
...-schema-validator/src/helpers/is-scalar-or-enum.ts	100.00% <ø> (ø)
...rc/validators/relation-required-with-belongs-to.ts	95.23% <ø> (-0.22%)	⬇️
packages/amplify-util-mock/src/api/api.ts	0.00% <0.00%> (ø)
.../amplify-util-mock/src/api/lambda-arn-to-config.ts	100.00% <ø> (ø)
packages/amplify-util-mock/src/mockAll.ts	0.00% <ø> (ø)
packages/amplify-util-mock/src/storage/storage.ts	0.00% <0.00%> (ø)
... and 11 more

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