MM-62558 Add E2E tests for custom profile settings (#30722)

* add e2e tests for custom profile settings

* fix failed tests

* reorg folder and file convention, and add more details of the tests

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

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

@@ -61,6 +61,7 @@ services:
       MM_CLUSTERSETTINGS_READONLYCONFIG: "false"
       MM_SERVICEENVIRONMENT: "test"
       MM_FEATUREFLAGS_MOVETHREADSENABLED: "true"
+      MM_FEATUREFLAGS_CUSTOMPROFILEATTRIBUTES: "true"
       MM_LOGSETTINGS_ENABLEDIAGNOSTICS: "false"
       MM_LOGSETTINGS_CONSOLELEVEL: "DEBUG"
     network_mode: host