feat: flip feature flag to change default identity claim

[danielleadams]

Description of changes

Flips the feature flag to change the default identity claim for the GQL APIs. Described in these docs: https://docs.amplify.aws/cli/migration/identity-claim-changes/

Checklist

• PR description included
• yarn test passes
• Relevant documentation is changed or added (and PR referenced)

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 #10580 (438bad8) into master (b4b297e) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #10580   +/-   ##
=======================================
  Coverage   47.30%   47.30%           
=======================================
  Files         665      665           
  Lines       32880    32880           
  Branches     6632     6632           
=======================================
+ Hits        15554    15555    +1     
+ Misses      15657    15656    -1     
  Partials     1669     1669           

Impacted Files	Coverage Δ
...amplify-cli-core/src/feature-flags/featureFlags.ts	80.85% <ø> (ø)
...li/src/domain/amplify-usageData/getUsageDataUrl.ts	100.00% <0.00%> (+12.50%)	⬆️

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