Plugin governance per role, install policy, and discovery

Workspace admins and owners can now manage plugins from Workspace settings > Plugins. Page includes plugin discovery and governance with search and filters for status, installation policy, roles, category, and catalog. Workspace owners can enable or disable plugins for workspace or select roles from Workspace settings > Permissions & Roles. Admins and owners can set whether plugins are available for members to install or installed by default for workspace or specific roles. Admins can view apps the plugin uses and manage plugins from this view.