retry tests 3 times before failing (#2335)

Some tests are relying on timing specific tests and if the server
(GitHub Actions) is a bit busy, then this can result in flakey tests.

One day we will switch to tests in a real browser, but in the meantime
this should be enough.

.github/workflows/main.yml

@@ -60,7 +60,8 @@ jobs:
           path: '**/node_modules'
           key: ${{ runner.os }}-${{ env.NODE_VERSION }}-modules-${{ hashFiles('**/yarn.lock') }}
       - name: Test
-        run: yarn test
+        run: |
+          yarn test || yarn test || yarn test || exit 1
         env:
           CI: true
 

.github/workflows/release-insiders.yml

@@ -40,7 +40,8 @@ jobs:
           CI: true
 
       - name: Test
-        run: npm test
+        run: |
+          yarn test || yarn test || yarn test || exit 1
         env:
           CI: true