fix(graphql-auth-transformer): protection for connection types

[chrisjprior]

When generating auth directives to protect fields decorated by @connection we now protect the
operation including its return type instead of protecting only the field. This is important for the
case where queries are not defined on the nested model type since they wont be generated for the
schemas Query.operation.

"fix #4874", "fix #5510" "fix #6104"

Issue #, if available:

Description of changes:

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 #5655 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5655      +/-   ##
==========================================
+ Coverage   57.89%   57.94%   +0.04%     
==========================================
  Files         410      410              
  Lines       18709    18709              
  Branches     3738     3543     -195     
==========================================
+ Hits        10831    10840       +9     
- Misses       7194     7205      +11     
+ Partials      684      664      -20     

Impacted Files	Coverage Δ
...aphql-auth-transformer/src/ModelAuthTransformer.ts	88.51% <100.00%> (+0.78%)	⬆️
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	69.86% <0.00%> (ø)
.../amplify-util-mock/src/utils/lambda/loadMinimal.ts	0.00% <0.00%> (ø)
...graphql-transformer-core/src/TransformerContext.ts	25.09% <0.00%> (ø)
... and 12 more

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[akshbhu]

Thanks for the Contribution @chrisjprior.

It looks good to me to add necessary auth directives when the query argument is null in @model directive. I missed this case when I was trying to repro this issue #4874
I will ping this to one more member of the team to have a look and approve this.

[akshbhu]

LGTM!

[github-actions]

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