fix: internal add auth entry point

[edwardfoyle]

Issue #, if available:

Description of changes:
Internal calls to add auth use a different entry point into the category which had some logic that was duplicated since the refactor

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 #5281 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #5281      +/-   ##
==========================================
- Coverage   60.37%   60.36%   -0.01%     
==========================================
  Files         391      391              
  Lines       17177    17178       +1     
  Branches     3397     3215     -182     
==========================================
  Hits        10370    10370              
- Misses       6251     6272      +21     
+ Partials      556      536      -20     

Impacted Files	Coverage Δ
...awscloudformation/handlers/get-add-auth-handler.ts	29.41% <0.00%> (-1.84%)	⬇️
...udformation/utils/post-add-auth-message-printer.ts	12.50% <0.00%> (ø)
packages/amplify-util-mock/src/api/api.ts	0.00% <0.00%> (ø)
packages/graphql-mapping-template/src/print.ts	34.65% <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	42.18% <0.00%> (ø)
.../amplify-util-mock/src/utils/lambda/loadMinimal.ts	0.00% <0.00%> (ø)
... and 11 more

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[github-actions]

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