E2E Tests: unify compose files, support Opensearch (#28716)

* Unify docker-compose files, support opensearch and redis
* Support cypress/playwright bools, MM_SERVICE_OVERRIDES input
* Remove unused directives from E2E tests
* [skip ci] Fix ES tests, PR messages
* [skip ci] Fix service pruning on server restart
* [skip ci] Make services overrides a CSV, better param descriptions

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/.ci/.e2erc

@@ -103,8 +103,13 @@ case "${TEST:-$TEST_DEFAULT}" in
 esac
 # OS specific defaults overrides
 case $MME2E_OSTYPE in
+  linux )
+    export IS_LINUX="-linux"
+    ;;
   darwin )
-    BROWSER_DEFAULT="electron" ;;
+    export BROWSER_DEFAULT="electron"
+    export IS_LINUX=""
+    ;;
   * )
 esac