fix(tests): run e2e tests on Chrome and Firefox (#39568)

* Add scripts for Cypress to run on other browsers

* Run Cypress on different browsers in workflow

* Install Brave and run it in Cypress

* Run Cypress on only CHrome and FIrefox

* Revert Cypress plugin

.github/workflows/cypress.yml

@@ -15,6 +15,9 @@ jobs:
       # This installs it specifically in the CI runs.
       CYPRESS_INSTALL_BINARY: '4.11.0'
     runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        browsers: [chrome, firefox]
     services:
       mongodb:
         image: mongo:3.6.19
@@ -54,3 +57,5 @@ jobs:
           # left for testing.
           wait-on-timeout: 1200
           config: baseUrl=http://localhost:8000
+          browser: ${{ matrix.browsers }}
+          headless: true