Get rid of old ClassBasedActionsFeature.

Review Request #132 — Created Dec. 22, 2022 and updated Jan. 18, 2023, 6:52 p.m.

Information
Owner:	guest175
Repository:	Review Board
Branch:
Bugs:
Depends On:
Commit:	62f3d3d...
Reviewers
Groups:
People:	frederic

Description

We had introduced a feature flag for using class-based actions with
extensions. This never got promoted beyond `UNAVAILABLE`, and the new
actions framework won't use it. This change gets rid of it entirely.

Testing Done:
Ran unit tests.

Reviewed at https://reviews.reviewboard.org/r/12756/

Testing Done

Issues

Description	From	Last Updated
I am commenting on this line. It is a fine line.	guest8739	Jan. 18, 2023, 7:31 p.m.
I am commenting on this line... it is a very fine line.	guest8739	Jan. 18, 2023, 6:52 p.m.

```
Hello World
```

reviewboard/extensions/tests/test_action_hooks.py (Diff revision 1)
Show all issues
```
I am commenting on this line... it is a very fine line.
```

reviewboard/extensions/tests/test_action_hooks.py (Diff revision 1)
Show all issues
```
I am commenting on this line. It is a fine line.
```

You have a pending review.

Review Board 5.0.2 alpha 0 (dev)

Get rid of old ClassBasedActionsFeature.