Fix E2E test cases and setup for GHA (#26944)

* Fix E2E test cases and setup for GHA
* Fix more test cases, apply recommendations

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

@@ -3,6 +3,16 @@ set -e -u -o pipefail
 cd "$(dirname "$0")"
 . .e2erc
 
+mme2e_log "Configuring starting server parameters that may be changed at runtime"
+for SETTING in \
+    TeamSettings.EnableOpenServer=true \
+    PluginSettings.Enable=true \
+    PluginSettings.EnableUploads=true \
+    PluginSettings.AutomaticPrepackagedPlugins=true
+  do
+  mme2e_log "Configuring parameter: $SETTING"
+  ${MME2E_DC_SERVER} exec -T -- server mmctl --local config set $(tr = ' ' <<<$SETTING)
+done
 if [ -n "${MM_LICENSE:-}" ]; then
   # We prefer uploading the license here, instead of setting the env var for the server
   # This is to retain the flexibility of being able to remove it programmatically, if the tests require it