fix: #4175 - enable Cognito case insensitive usernames for new projects and new auth resources

[attilah]

Issue #, if available:

fix: #4175 - enable Cognito case insensitive usernames for new projects behind a feature flag.

Description of changes:

auth.enableCaseInsensitivity feature flag was added to not to break existing deployment. When a new auth resource is added and the flag's value is true case insensitivity for Cognito User Pools will be enabled.

New projects created will have this enabled by default.

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

[codecov]

Codecov Report

Merging #6065 (78529fb) into master (820e733) will decrease coverage by 0.00%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master    #6065      +/-   ##
==========================================
- Coverage   58.32%   58.31%   -0.01%     
==========================================
  Files         446      446              
  Lines       20274    20278       +4     
  Branches     4009     3802     -207     
==========================================
+ Hits        11824    11826       +2     
- Misses       7630     7652      +22     
+ Partials      820      800      -20     

Impacted Files	Coverage Δ
.../awscloudformation/utils/auth-defaults-appliers.ts	62.96% <33.33%> (-3.71%)	⬇️
.../src/provider-utils/awscloudformation/constants.ts	100.00% <100.00%> (ø)
...amplify-cli-core/src/feature-flags/featureFlags.ts	80.58% <100.00%> (+0.09%)	⬆️
packages/amplify-util-mock/src/api/api.ts	0.00% <0.00%> (ø)
packages/graphql-mapping-template/src/print.ts	35.29% <0.00%> (ø)
packages/amplify-util-mock/src/storage/storage.ts	0.00% <0.00%> (ø)
...ges/amplify-util-mock/src/CFNParser/stack/index.ts	0.00% <0.00%> (ø)
...es/amplify-util-mock/src/api/resolver-overrides.ts	0.00% <0.00%> (ø)
...es/graphql-transformer-core/src/stripDirectives.ts	35.29% <0.00%> (ø)
.../amplify-cli-core/src/state-manager/pathManager.ts	67.85% <0.00%> (ø)
... and 12 more

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[edwardfoyle]

Just one small comment. Also, are we surfacing this functionality to customers in any way besides the FF docs? (ie if I have an existing project and I wanted to make this change, how would I learn about this)

[edwardfoyle]

it's kinda confusing that the FF is "case insensitive" but the CFN value is "case sensitive". I'd recommend naming the FF "isUsernameCaseSensitive"

[attilah]

This aligns with how it is named in the Cognito Console. That's the reason for the naming, I agree that comparing CFN and this counter intuitive, but in the Cognito Console it is like this.

[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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