fix: remove project from cache key for project scoped credentials

[pjiang-dev]

cherry-pick of db9c82a

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

[codecov]

Codecov Report

❌ Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.27%. Comparing base (4826fb0) to head (9f62f76).
⚠️ Report is 32 commits behind head on release-2.14.

Files with missing lines	Patch %	Lines
util/helm/client.go	66.66%	2 Missing ⚠️
reposerver/repository/repository.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-2.14   #22816      +/-   ##
================================================
- Coverage         55.30%   55.27%   -0.04%     
================================================
  Files               339      339              
  Lines             57341    57345       +4     
================================================
- Hits              31715    31699      -16     
- Misses            22938    22950      +12     
- Partials           2688     2696       +8     

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