Remove is_profile_verified() and is_protected() APIs

[Hocuri]

Depends on #7080

With 2.X releases,

• the UIs are not supposed to use the is_profile_verified() API anymore, so, we can just remove it now without a deprecation period.
• The UIs only use the is_protected() API in order to tell the user that they can't add an unverified contact to a protected chat. So, after Propagate verification status via Autocrypt-Gossip attribute #7080, we can deprecate and remove that API.

[link2xt]

I am going to implement it inside of #7116 so we have a single PR that does all changes at once.

Also removing is_protection_broken.