Enable BrowserStack tests (#22457)

### Description
BrowserStack account issues have been resolved -- this PR enables E2E
browserstack tests in the pipeline again

Author: carzh

tools/ci_build/github/azure-pipelines/templates/android-java-api-aar-test.yml

@@ -72,7 +72,6 @@ jobs:
       stop: true
 
   # we run e2e tests on one older device (Pixel 3) and one newer device (Galaxy 23)
-  # disabling this step until BrowserStack account issues are resolved
   - script: |
       set -e -x
       pip install requests
@@ -84,7 +83,6 @@ jobs:
     displayName: Run E2E tests using Browserstack
     workingDirectory: $(Build.BinariesDirectory)/android_test/android/app/build/outputs/apk
     timeoutInMinutes: 15
-    enabled: false
     env:
       BROWSERSTACK_ID: $(browserstack_username)
       BROWSERSTACK_TOKEN: $(browserstack_access_key)