Remove SF_PUSH_KEY from GitHub actions

[Nateowami]

When a GitHub action creates a PR, GitHub actions don't run on that PR, because GitHub tries to prevent that type of thing (probably in order to prevent infinite actions, and/or security implications).

A workaround for that is to give an action credentials to act on behalf of a user. I attempted to do that when setting up the workflows that open PRs by using an SSH key as the credential when pushing changes, as this is one of the documented methods in the peter-evans/create-pull-request repo.

Unfortunately this was never successful, and I later discovered that closing and reopening the PR was enough to trigger the workflows.

This PR removes an unneeded secret and brings it in line with our other PR-creating workflows. Once merged, I intend to delete the secret from the repo, so no actions can access it.

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This change is 

[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🚩 GITHUB_TOKEN vs SSH deploy key: CI triggers on created PRs

With the SSH deploy key removed, the workflow now relies on GITHUB_TOKEN for authentication. A well-known difference is that PRs created using GITHUB_TOKEN do not trigger subsequent GitHub Actions workflows (e.g., CI checks), whereas PRs created via a deploy key or PAT do. However, since the other analogous workflows (update-font-list.yml:17-19, update-npm-audit.yml:17-19) already operate without an SSH key and presumably work fine, this is likely an accepted tradeoff in this repository. If CI checks running automatically on the created i18n/update PR branch are important, this could be a concern.

(Refers to lines 17-20)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.29%. Comparing base (3685f14) to head (b655a34).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3760   +/-   ##
=======================================
  Coverage   81.29%   81.29%           
=======================================
  Files         621      621           
  Lines       39114    39114           
  Branches     6358     6358           
=======================================
  Hits        31798    31798           
  Misses       6344     6344           
  Partials      972      972           

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[RaymondLuong3]

Thanks for the explanation. I approve. I'll let you merge this so that you remember to delete the secret from the repo as you mentioned.

@RaymondLuong3 reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on Nateowami).

[Nateowami]

@RaymondLuong3 Thanks; that was smart thinking. I've deleted the secret and run the workflow to make sure it is still functional.