refactor(api): Allow adding/removing tips on HW API without await

[SyntaxColoring]

Changelog

• Turn API.remove_tip() and OT3API.remove_tip() non-async. This will help with EXEC-779 by letting us keep the whole auto-fixup process non-async.
• Same for .add_tip(). This isn't directly helpful to us because we use .cache_tip() anyway, but it's nice for consistency.
• A couple other minor cleanups.

Test Plan and Hands on Testing

• Make sure all CI keeps passing.

Review requests

• Is there any reason we would want these methods to be async?
• Is it sufficient to ensure that all of CI keeps passing, or are there hidden things that this might break?

Risk assessment

Low if CI covers everything that calls this.

[sfoster1]

Looks good. I expect ci is fine. I think these were made async in the past for looking-forward-to-IPC-implementation reasons.