[IMPROVEMENT] Remove Markdown tags from in some parts of the app

[rafaelks]

• In-app notifications;
• Reply/Quote pop-up;
• Push notifications

[Sameesunkaria]

@rafaelks for in-app notifications, the markdown should be removed from the backend.

There’s already an issue for that (posted by you) RocketChat/Rocket.Chat#9979.
You could maybe update it to mention the same requirement for desktop notifications? 🤔

[rafaelks]

@Sameesunkaria For now, we can remove the markdown by simply getting the cached value on Markdown library and transforming it in pure String (.string attribute of NSAttributedString). Would you mind doing this?