CLD-7841 Optimize E2E testing costs (#27883)

* Utilize free runners for E2E tests, report back to PR on run completion
* Increase test stability on smaller instances
* Merge worker reports
* merge start+prepare steps
* upgrade keycloak
* increase test timeouts
* Add video recording to report artifacts

Co-authored-by: Saturnino Abril <5334504+saturninoabril@users.noreply.github.com>

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Co-authored-by: Saturnino Abril <5334504+saturninoabril@users.noreply.github.com>

e2e-tests/.ci/server.generate.sh

@@ -276,7 +276,6 @@ generate_env_files() {
 
   # Generating TEST-specific env files
   # Some are defaulted in .e2erc due to being needed to other scripts as well
-  export CI_BASE_URL="${CI_BASE_URL:-http://localhost:8065}"
   export REPO=mattermost # Static, but declared here for making generate_test_cycle.js easier to run
   export HEADLESS=true   # Static, but declared here for making generate_test_cycle.js easier to run
   case "$TEST" in