refactor(ui): use pnpm package manager

[g1eny0ung]

What's changed and how it works?

In this PR, I change the package manager from yarn to pnpm.

The old yarn classic (v1) has some usage bugs (like this: yarnpkg/yarn#7807) that disturb daily development work. But it is no longer updated anymore.

So for long-term considerations, the pnpm is a good replacement choice. It's fast and disk space efficient, I've used it in several projects and it works fine with monorepo. It has been tested by time!

Related changes

• This change also requires further updates to the website (e.g. docs)
• This change also requires further updates to the UI interface
• Need to cheery-pick to release branches
  • release-2.5
  • release-2.4

Checklist

CHANGELOG

• I have updated the CHANGELOG.md
• I have labeled this PR with "no-need-update-changelog"

Tests

• Unit test
• E2E test
• No code
• Manual test (add steps below)

Side effects

• Breaking backward compatibility

DCO

If you find the DCO check fails, please run commands like below (Depends on the actual situations. For example, if the failed commit isn't the most recent) to fix it:

git commit --amend --signoff
git push --force

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[codecov]

Codecov Report

Merging #3965 (1475bea) into master (373785d) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3965      +/-   ##
==========================================
- Coverage   38.60%   38.52%   -0.09%     
==========================================
  Files         165      165              
  Lines       13698    13698              
==========================================
- Hits         5288     5277      -11     
- Misses       7979     7991      +12     
+ Partials      431      430       -1     

Impacted Files	Coverage Δ
.../workflow/controllers/workflow_entry_reconciler.go	49.18% <0.00%> (-4.87%)	⬇️
pkg/workflow/controllers/utils.go	86.04% <0.00%> (-1.56%)	⬇️

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