Consistent naming for utils and utilising shared folder

[salmanmkc]

Reason for doing this is to standardise the approach for having shared utils or the naming across the files.
This pull request includes several changes to update import paths across multiple test and source files. The primary change is renaming the import path from util to utils in various files within the packages/artifact and packages/cache directories.

Changes to utility imports:

• Updated import statements to use utils instead of util in multiple test files:

  • packages/artifact/__tests__/delete-artifacts.test.ts
  • packages/artifact/__tests__/download-artifact.test.ts
  • packages/artifact/__tests__/get-artifact.test.ts
  • packages/artifact/__tests__/list-artifacts.test.ts
  • packages/artifact/__tests__/upload-artifact.test.ts
  • packages/artifact/__tests__/utils.test.ts

• Updated import statements to use utils instead of util in source files:

  • packages/artifact/src/internal/delete/delete-artifact.ts
  • packages/artifact/src/internal/download/download-artifact.ts
  • packages/artifact/src/internal/find/get-artifact.ts
  • packages/artifact/src/internal/find/list-artifacts.ts
  • packages/artifact/src/internal/shared/artifact-twirp-client.ts
  • packages/artifact/src/internal/upload/upload-artifact.ts

Changes to cache utilities:

• Updated import statements to use shared/utils instead of cacheUtils in cache-related test files:
  • packages/cache/__tests__/cacheHttpClient.test.ts
  • packages/cache/__tests__/cacheUtils.test.ts
  • packages/cache/__tests__/downloadUtils.test.ts
  • packages/cache/__tests__/requestUtils.test.ts
  • packages/cache/__tests__/restoreCache.test.ts [1] [2]
  • packages/cache/__tests__/restoreCacheV2.test.ts [1] [2]
  • packages/cache/__tests__/saveCache.test.ts [1] [2] [3]