refactor: switch to codecov-uploader GitHub Action

[jsjoeio]

codecov deprecated their Node wrapper for uploading coverage reports.

This removes that and uses their new uploaded along with the v2 GitHub
Action they maintain.

Fixes N/A

[github-actions]

✨ code-server docs for PR #5303 is ready! It will be updated on every commit.

• Host: https://coder.com/docs/code-server/3a83645
• Last deploy status: success
• Commit: 336b5a0
• Workflow status: https://github.com/coder/code-server/actions/runs/2572484135

[codecov]

Codecov Report

Merging #5303 (336b5a0) into main (c51ff3b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5303   +/-   ##
=======================================
  Coverage   72.47%   72.47%           
=======================================
  Files          30       30           
  Lines        1671     1671           
  Branches      367      367           
=======================================
  Hits         1211     1211           
  Misses        397      397           
  Partials       63       63           

---

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[github-actions]

✨ code-server dev build published to npm for PR #5303!

• Last publish status: success
• Commit: 336b5a0

To install in a local project, run:

npm install @coder/code-server-pr@5303

To install globally, run:

npm install -g @coder/code-server-pr@5303

[code-asher]

Looks like the integration test fix will collide with another PR, possibly we leave it out of this one since it is unrelated to codecov?

[code-asher]

Ooops I was too slow to type that lol

[jsjoeio]

Looks like the integration test fix will collide with another PR, possibly we leave it out of this one since it is unrelated to codecov?

lol whoops, my bad. I will fix the other PR. at least the commit message matches that fix