Remove command palette POC (#24044)

* Revert "POC: Cross-team recent search (#20027)"

This reverts commit aa59c28b04, preserving
a few code tidyings unrelated to the original PR.

* Revert "Add feature flag for command palette (#20011)"

This reverts commit c78c5ce3f3.

server/channels/app/plugin_api.go

@@ -546,7 +546,7 @@ func (api *PluginAPI) SearchPostsInTeamForUser(teamID string, userID string, sea
 		includeDeletedChannels = *searchParams.IncludeDeletedChannels
 	}
 
-	results, appErr := api.app.SearchPostsForUser(api.ctx, terms, userID, teamID, isOrSearch, includeDeletedChannels, timeZoneOffset, page, perPage, model.ModifierMessages)
+	results, appErr := api.app.SearchPostsForUser(api.ctx, terms, userID, teamID, isOrSearch, includeDeletedChannels, timeZoneOffset, page, perPage)
 	if results != nil {
 		results = results.ForPlugin()
 	}