fix(@aws-amplify/datastore): fix hasOne delete

[iartemiev]

Description of changes

Allow deleting records that have a Has One relation. Perform a cascading delete.

Note: This library bugfix relies on a recent Codegen change, and in order to work correctly, this feature flag needs to be set to true. Starting 5/1 this will be the default CLI/Codegen behavior for new projects.

Issue #, if available

#6560

Description of how you validated changes

• Created unit tests for both of the JS Storage Adapters
• Manually validated in a sample
• Created an e2e test: https://github.com/aws-amplify/amplify-js-samples-staging/pull/216

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
  Relevant documentation is changed or added (and PR referenced) N/A

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 #8191 (f1faafa) into main (918797e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #8191      +/-   ##
==========================================
+ Coverage   76.90%   76.91%   +0.01%     
==========================================
  Files         233      233              
  Lines       15222    15228       +6     
  Branches     2975     2979       +4     
==========================================
+ Hits        11706    11713       +7     
+ Misses       3289     3288       -1     
  Partials      227      227              

Impacted Files	Coverage Δ
packages/datastore/__tests__/helpers.ts	100.00% <ø> (ø)
packages/datastore/src/types.ts	81.08% <ø> (ø)
...tastore/src/storage/adapter/AsyncStorageAdapter.ts	78.04% <100.00%> (+0.27%)	⬆️
.../datastore/src/storage/adapter/IndexedDBAdapter.ts	81.76% <100.00%> (+0.15%)	⬆️
...ges/datastore/src/storage/adapter/InMemoryStore.ts	77.27% <0.00%> (+4.54%)	⬆️

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[manueliglesias]

LGTM 👍 🎉

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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