Disable `PLR1714` while it is incompatible with `mypy`

[thierry-martinez]

PLR1714 suggests rewriting code like:

if cmd.kind == CommandKind.X or cmd.kind == CommandKind.Z: ...

into

if cmd.kind in {CommandKind.X, CommandKind.Z}: ...

While it can be considered to legitimately improve readability, mypy currently does not understand that cmd is an instance of X or Z in the if-block, whereas mypy is able to understand it in the original code with or.

@EarlMilktea suggests that we disable PLR1714 while it is incompatible with mypy.

A caveat is that we won't benefit from such suggestions in case where we don't need mypy's type narrowing, but I guess most of the time we are in a context where we need such narrowing, so it makes sense to disable the rule entirely.

[EarlMilktea]

LGTM!