fix: error message for amplify init -y in already existing project

[mikigraf]

Description of changes

As of https://github.com/aws-amplify/amplify-cli/issues/11579 this PR introduces a more helpful message in case of running

amplify init -y

twice in the same directory or in a directory already containing a project.

Issue #, if available

https://github.com/aws-amplify/amplify-cli/issues/11579

Description of how you validated changes

I built the CLI and run it twice in another directory:

amplify init
amplify init -y

Checklist

• [x] PR description included
• [x] 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 #12287 (badef01) into dev (984c0f8) will decrease coverage by 2.35%. The diff coverage is 57.30%.

:mega: This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@            Coverage Diff             @@
##              dev   #12287      +/-   ##
==========================================
- Coverage   49.45%   47.11%   -2.35%     
==========================================
  Files         692      837     +145     
  Lines       33424    38098    +4674     
  Branches     6840     7732     +892     
==========================================
+ Hits        16529    17948    +1419     
- Misses      15370    18508    +3138     
- Partials     1525     1642     +117     

Impacted Files	Coverage Δ
...mplify-appsync-simulator/src/resolvers/function.ts	15.38% <ø> (ø)
...s/amplify-appsync-simulator/src/type-definition.ts	100.00% <ø> (ø)
...sync-simulator/src/velocity/util/dynamodb-utils.ts	6.55% <0.00%> (ø)
...y-appsync-simulator/src/velocity/util/map-utils.ts	10.00% <ø> (ø)
...tor/src/velocity/util/transform/dynamodb-filter.ts	4.93% <0.00%> (ø)
...appsync-simulator/src/velocity/value-mapper/map.ts	86.88% <ø> (ø)
...ackages/amplify-category-auth/src/commands/auth.ts	0.00% <0.00%> (ø)
...ges/amplify-category-auth/src/commands/auth/add.ts	0.00% <ø> (ø)
...es/amplify-category-auth/src/commands/auth/help.ts	0.00% <0.00%> (ø)
.../amplify-category-auth/src/commands/auth/import.ts	0.00% <0.00%> (ø)
... and 94 more

... and 468 files with indirect coverage changes

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more

[goldbez]

@mikigraf Can you please address these comments? Thank you for your contribution.

[mikigraf]

Yes, I will do it this week

[mikigraf]

Yes, will do this week, sorry that it takes so long

[offlineprogrammer]

@mikigraf thanks for the contribution! Thought to check in if you had time to write the test for this, let us know if you need anything