Refactor to use BasicTask and Operations

[djmitche]

This refactors a bunch of Replica methods and the high-level Task/TaskMut to use BasicTask and commit operations to achieve their goals.

I summarize all of the deprecations together in a later commit, with the breaking changes.

This is one of the "boring" bits for #372 - the next is, too, and then we get to the interesting breaking changes.

[ryneeverett]

• I'm seeing a few self.task.task in TaskMut and task.task.task in tests which I believe could be reduced by one ".task" due to Deref.
• I noticed that clippy is broken in CI again: Error: Unable to create clippy annotations! Reason: HttpError: Resource not accessible by integration and there appear to be some relevant warnings. It sure would be nice if the check would fail.

[djmitche]

I'm seeing a few self.task.task in TaskMut and task.task.task in tests which I believe could be reduced by one ".task" due to Deref.

This doesn't work because deref only works for method calls, so self.task.foo() uses the task property on TaskMut, of type Task, and then looks for a foo method on it. Later PRs will address this, in particular when Task and TaskMut are unified into a single type.

I noticed that clippy is broken in CI again

Oops, thanks for spotting that! A downside of a lot of rebasing.

I have a little more work to do here and will request review.

[ryneeverett]

Looks good. I don't entirely understand all the testing changes in the last commit but I presume they pertain to removing apply in the next PR.

[djmitche]

Looks good. I don't entirely understand all the testing changes in the last commit but I presume they pertain to removing apply in the next PR.

Yeah, a lot of the tests are in terms of SyncOp instead of Operation, and that gets addressed in the next PR ("Prefer Operation instead of SyncOp"). So, for this PR I've kept the SyncOp-related methods as test-only.