[NEW] Admin refactor Second phase (#17551)

* [NEW] Redesign Administration > Connectivity Services (#17525)

* [NEW] Admin Rewrite ->  Integrations Page (#17505)

* [NEW] Admin Rewrite -> OAuth Apps (#17646)

Co-authored-by: Guilherme Gazzo <guilhermegazzo@gmail.com>
Co-authored-by: Tasso Evangelista <tasso.evangelista@rocket.chat>
Co-authored-by: gabriellsh <40830821+gabriellsh@users.noreply.github.com>