follow_operation does not properly use BooleanLike

Environment

• Installation type (OTP or From Source): OTP
• Pleroma version (could be found in the "Version" tab of settings in Pleroma-FE): v2.4.4
• Elixir version (elixir -v for from source installations, N/A for OTP): N/A
• Operating system: Alpine
• PostgreSQL version (psql -V): Not relevant

Bug description

Similar to #1782 (closed), caused by the way mastodon.py operates (sends a string, results in a 400 reblogs - Invalid boolean. Got: string.), effectively breaking follow functionality of the library.

The line in question that causes this is https://git.pleroma.social/pleroma/pleroma/-/blob/v2.4.4/lib/pleroma/web/api_spec/operations/account_operation.ex#L226 (and on develop, the one for notify too, a couple lines below), and can be fixed by changing type: :boolean, to type: BooleanLike,. All other parameters in this file use BooleanLike.

MR: !3787 (merged)