fix: set default sourceDir for react-native projects to 'src'

[edwardfoyle]

Issue #, if available:
#6269

Description of changes:
change default SourceDir from / to src for react-native projects. This is consistent with other project structures and removes a disparity between where types were generated and where the CLI tries to locate them by default.

Tested in projects initialized using expo and react-native CLI

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

[nikhname]

lgtm!

[codecov]

Codecov Report

Merging #6319 (61075c6) into master (091e148) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #6319    +/-   ##
========================================
  Coverage   57.12%   57.12%            
========================================
  Files         471      471            
  Lines       21554    21554            
  Branches     4066     4281   +215     
========================================
  Hits        12313    12313            
+ Misses       8381     8361    -20     
- Partials      860      880    +20     

Impacted Files	Coverage Δ
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	67.44% <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)
...mplify-appsync-simulator/src/resolvers/function.ts	15.38% <0.00%> (ø)
... and 9 more

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[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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