[MM-59060] Remove pre release features section from advanced section of user settings (#27608)

e2e-tests/playwright/support/server/default_config.ts

@@ -159,7 +159,6 @@ const defaultServerConfig: AdminConfig = {
         EnableUserStatuses: true,
         ExperimentalEnableAuthenticationTransfer: true,
         ClusterLogTimeoutMilliseconds: 2000,
-        EnablePreviewFeatures: true,
         EnableTutorial: true,
         EnableOnboardingFlow: true,
         ExperimentalEnableDefaultChannelLeaveJoinMessages: true,