build: use pnpm as the package manager instead of yarn (#62926)

Use pnpm instead of yarn as the package manager and interaction tool for the repo

PR Close #62926

.github/actions/saucelabs-legacy/action.yml

@@ -34,7 +34,7 @@ runs:
       run: ./tools/saucelabs/sauce-service.sh ready-wait
     - name: Running tests on Saucelabs.
       shell: bash
-      run: KARMA_WEB_TEST_MODE=SL_REQUIRED yarn karma start ./karma-js.conf.js --single-run
+      run: KARMA_WEB_TEST_MODE=SL_REQUIRED pnpm karma start ./karma-js.conf.js --single-run
     - name: Stop Saucelabs tunnel service
       shell: bash
       run: ./tools/saucelabs/sauce-service.sh stop

.github/actions/yarn-install/action.yml

@@ -1,17 +0,0 @@
-name: 'Installing Yarn dependencies'
-description: 'Installs the dependencies using Yarn'
-
-runs:
-  using: 'composite'
-  steps:
-    - uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4
-      with:
-        path: |
-          ./node_modules/
-        # If just `WORKSPACE` or `yarn.lock` is changed, the most recent cache can be restored.
-        # See: https://docs.github.com/en/actions/guides/caching-dependencies-to-speed-up-workflows#example-using-the-cache-action.
-        key: v1-angular-main-deps-${{hashFiles('WORKSPACE')}}-${{hashFiles('yarn.lock')}}
-        restore-keys: v1-angular-main-deps-
-
-    - run: yarn install --frozen-lockfile --non-interactive
-      shell: bash