CI: Temporarily remove setting up gems from the instrumented tests job

As expected this job is currently failing, see below:

:rubygems: Setting up Gems
Using a8c-ci-cache as cache bucket
No cache entry found for 'woocommerce-android-Darwin-arm64-libcmacos-
 15.3.2-ruby3.2.2-xyz'
Fetching bundler-2.5.20.gem
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.6.0
     directory.
🚨 Error: The command exited with status 1
user command error: exit status 1

------------------------------------------------------------------------

Anyway, executing 'gradlew' and the 'connectedDebugAndroidTest'
directly, without setting up any Gems, or installing secrets should be
enough for now and this phase of testing.

Author: ParaskP7

.buildkite/pipeline.yml

@@ -13,12 +13,6 @@ steps:
 
   - label: "Instrumented tests (ReviewsUITest)"
     command: |
-      echo "--- :rubygems: Setting up Gems"
-      install_gems
-
-      echo "--- :closed_lock_with_key: Installing Secrets"
-      bundle exec fastlane run configure_apply
-
       echo "--- 🧪 Testing"
       ./gradlew :WooCommerce:connectedVanillaDebugAndroidTest -Pandroid.testInstrumentationRunnerArguments.class=com.woocommerce.android.e2e.tests.ui.ReviewsUITest
     plugins: [ $CI_TOOLKIT ]