MM-52282 Remove ExperimentalSettings.PatchPluginsReactDOM (#23172)

* MM-52282 Remove ExperimentalSettings.PatchPluginsReactDOM

* Fix missing file from last commit

* Fix test usage of plugin.NewEnvironment

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

@@ -530,7 +530,6 @@ const defaultServerConfig: AdminConfig = {
         EnableSharedChannels: false,
         EnableRemoteClusterService: false,
         EnableAppBar: false,
-        PatchPluginsReactDOM: false,
         DisableRefetchingOnBrowserFocus: false,
         DelayChannelAutocomplete: false,
     },