Summary:

Update the deprecation classes used in Review Board.

Review Request #12327 — Created June 2, 2022 and submitted June 8, 2022, 3:41 a.m.

Description

This removes the RemovedInReviewBoard40Warning class, and introduces
RemovedInReviewBoard60Warning and RemovedInReviewBoard70Warning.

RemovedInReviewBoard50Warning still remains, as we haven't removed the
deprecated code using it yet.

RemovedInNextReviewBoardVersionWarning has been set to
RemovedInReviewBoard60Warning.

Testing Done

Unit tests pass.

Used RemovedInReviewBoard60Warning in new in-progress code.

Commits

Summary
	Update the deprecation classes used in Review Board.

Screenshots

Issues

Description	From	Last Updated

flake8 passed.

JSHint passed.

Ship it!

Pushed to release-5.0.x (c1467ac)