[ty] Add new `unused-type-ignore-comment` rule (#22790)
## Summary
This PR splits the `unused-ignore-comment` into two rules:
* `unused-ignore-comment` same as today, but it now only reports unused
`ty: ignore` comments
* `unused-type-ignore-comment`: New, reports unused `type: ignore`
comment
The separation allows projects using multiple type checkers to disable
`unused-type-ignore-comments`
so that ty doesn't complain about `type: ignore` directies that are
needed by another type checker.
But they can still use `unused-ignore-comments `to be warned about
unused `ty: ignore` comments.
Fixes https://github.com/astral-sh/ty/issues/2494
## Test Plan
Updated tests
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Co-authored-by: Carl Meyer <carl@astral.sh>
