fix: #4657 preserve previous authSelections in update flow

[attilah]

Description of changes

Fix an update auth issue when update flow could end up enabling identity pool that leads to unintended resources during push.

Issue #, if available

fix: #4657 preserve previous authSelections in update flow

Description of how you validated changes

Manual testing

Checklist

• PR description included
• yarn test passes

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 #7255 (95193cf) into master (8775152) will decrease coverage by 4.15%.
The diff coverage is 45.68%.

@@            Coverage Diff             @@
##           master    #7255      +/-   ##
==========================================
- Coverage   56.43%   52.27%   -4.16%     
==========================================
  Files         445      491      +46     
  Lines       21859    25248    +3389     
  Branches     4373     4953     +580     
==========================================
+ Hits        12336    13199     +863     
- Misses       8745    11097    +2352     
- Partials      778      952     +174     

Impacted Files	Coverage Δ
.../awscloudformation/utils/auth-defaults-appliers.ts	89.65% <0.00%> (ø)
...ls/awscloudformation/utils/synthesize-resources.ts	16.00% <ø> (ø)
packages/amplify-cli-core/src/deploymentState.ts	100.00% <ø> (ø)
...amplify-cli-core/src/feature-flags/featureFlags.ts	83.10% <ø> (ø)
...-cli/src/extensions/amplify-helpers/git-manager.ts	85.18% <ø> (ø)
.../amplify-frontend-ios/lib/amplify-config-helper.js	1.01% <ø> (ø)
...provider-awscloudformation/src/aws-utils/aws-s3.ts	9.32% <0.00%> (-0.77%)	⬇️
...ion/src/iterative-deployment/deployment-manager.ts	7.05% <0.00%> (ø)
...y-provider-awscloudformation/src/resourceParams.js	15.15% <ø> (ø)
packages/amplify-util-mock/src/storage/storage.ts	0.00% <0.00%> (ø)
... and 94 more

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[github-actions]

👋 Hi, this pull request was referenced in the v4.51.0 release!

Check out the release notes here https://github.com/aws-amplify/amplify-cli/releases/tag/v4.51.0.