remove saucelabs run from material-web, it is not needed

.github/workflows/tests.yml

@@ -29,18 +29,3 @@ jobs:
 
     - name: Compile test TypeScript
       run: npm run build:tests
-
-    - name: Unit tests
-      env:
-        SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}
-        SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}
-      run: |
-        # Don't run Sauce from a forked repo, since the code may not be trusted
-        # and therefore secrets like the Sauce password are not available.
-        # GITHUB_HEAD_REF is only defined when building a fork.
-        if [ ! "$GITHUB_HEAD_REF" ]; then
-          export USE_SAUCE=true
-          export SAUCE_BUILD_ID=mwc-tests-${GITHUB_EVENT_NAME}-${GITHUB_ACTION}-${GITHUB_SHA}
-          export SAUCE_TUNNEL_ID=${SAUCE_BUILD_ID}-tunnel
-        fi
-        npm test

karma.conf.js

@@ -77,61 +77,4 @@ module.exports = function(config) {
       'FirefoxHeadless',
     ],
   });
-
-  if (process.env.USE_SAUCE) {
-    if (!process.env.SAUCE_USERNAME || !process.env.SAUCE_ACCESS_KEY) {
-      throw new Error(
-          'SAUCE_USERNAME and SAUCE_ACCESS_KEY must be set with USE_SAUCE')
-    }
-
-    const SAUCE_LAUNCHERS = {
-      'sl-edge': {
-        base: 'SauceLabs',
-        browserName: 'microsoftedge',
-        version: 'latest',
-        platform: 'Windows 10',
-      },
-      'sl-ie': {
-        base: 'SauceLabs',
-        browserName: 'internet explorer',
-        version: '11',
-        platform: 'Windows 8.1',
-      },
-      'sl-safari-14': {
-        base: 'SauceLabs',
-        browserName: 'safari',
-        version: '14',
-        platform: 'macOS 11.00',
-      },
-      'sl-safari-13': {
-        base: 'SauceLabs',
-        browserName: 'safari',
-        version: '13',
-        platform: 'macOS 10.15',
-      },
-      // 'sl-chrome-41': {
-      //   base: 'SauceLabs',
-      //   browserName: 'chrome',
-      //   version: '41',
-      //   platform: 'Linux'
-      // },
-    };
-
-    config.set({
-      sauceLabs: {
-        idleTimeout: 600,
-        testName: 'MWC Unit Tests',
-        build: process.env.SAUCE_BUILD_ID,
-        tunnelIdentifier: process.env.SAUCE_TUNNEL_ID,
-      },
-      // Attempt to de-flake Sauce Labs tests on TravisCI.
-      transports: ['polling'],
-      browserDisconnectTolerance: 1,
-      reporters: ['saucelabs', 'mocha'],
-
-      // TODO(aomarks) Update the browser versions here.
-      customLaunchers: SAUCE_LAUNCHERS,
-      browsers: [...config.browsers, ...Object.keys(SAUCE_LAUNCHERS)],
-    });
-  }
 };