[web] Add admin permissions modify-group-member and modify-managed-group-member (#27665)

* Add capability `modify-managed-group-member` & `modify-group-member`

* Check `modify-managed-group-member` & `modify-group-member` (backend)

* Check `modify-managed-group-member` & `modify-group-member` (frontend)

* Update tests

* Update with `ol-hasWriteAccess` flag

* Update tests

* Move functions to AdminAuthorizationHelper.js

* Update import to fix build error

* Add `ol-hasWriteAccess` to types

* Use `hasAdminAccess()` instead of `req?.user?.isAdmin`

* Add tests on `/manage/groups/:id/invites` depending on admin roles

* Reuse `UserMembershipAuthorization.hasAdminCapability`

* Fix: Add entityAccess check

* Update unit test

* Rename `hasAdminGroupMemberCapability` to `hasModifyGroupMemberCapability`

* Remove useless and redundant `hasWriteAccess` check

* Restore stub in afterEach

GitOrigin-RevId: 4b6d83751121b43d4c19d0dbd82a4833cf7a6f24

services/web/types/admin-capabilities.ts

@@ -5,9 +5,11 @@ export type AdminCapability =
   | 'create-subscription'
   | 'modify-feature-override'
   | 'modify-group'
+  | 'modify-group-member'
   | 'modify-group-setting'
   | 'modify-login-status'
   | 'modify-managed-group'
+  | 'modify-managed-group-member'
   | 'modify-project'
   | 'manage-survey'
   | 'modify-split-test'