The final 'Upload Coverage' step doesn't need local source or node_mo…

…dules (#1571)

## Summary:

I noticed this last step in our CI runs takes a bit of time for what amounts to downloading 2 files and then uploading them to Codecov. 

This action uses only other Github shared actions and so it doesn't need to checkout the source or install node_modules. This should speed up this last step in our CI runs somewhat. 

Issue: "none"

## Test plan:

I'll need to land this and then watch the next PR that runs this action.

Author: jeremywiebe

Reviewers: handeyeco, benchristel, SonicScrewdriver, Myranae, nicolecomputer, catandthemachines

Required Reviewers:

Approved By: handeyeco

Checks: ✅ gerald, ✅ codecov/project, ✅ codecov/patch, ✅ Upload Coverage (ubuntu-latest, 20.x), ⏭️  Publish npm snapshot, ✅ Check builds for changes in size (ubuntu-latest, 20.x), ✅ Lint, Typecheck, Format, and Test (ubuntu-latest, 20.x), ✅ Cypress (ubuntu-latest, 20.x), ✅ Check for .changeset entries for all changed files (ubuntu-latest, 20.x), ✅ Publish Storybook to Chromatic (ubuntu-latest, 20.x), ✅ Jest Coverage (ubuntu-latest, 20.x), ✅ gerald

Pull Request URL: #1571

.github/workflows/node-ci.yml

@@ -208,14 +208,6 @@ jobs:
                 node-version: [20.x]
         needs: [cypress, coverage]
         steps:
-            - uses: actions/checkout@v4
-
-            - name: Install & cache node_modules
-              uses: ./.github/actions/shared-node-cache
-              with:
-                  node-version: ${{ matrix.node-version }}
-                  ssh-private-key: ${{ secrets.KHAN_ACTIONS_BOT_SSH_PRIVATE_KEY }}
-
             - name: Download Jest Coverage
               uses: actions/download-artifact@v4
               with: