Rollup merge of #112297 - jyn514:remove-exclude-kind, r=Mark-Simulacrum

bootstrap: Disallow `--exclude test::std`

Use the top-level Kind to determine whether Steps are excluded.

Previously, this would use the `Kind` passed to `--exclude` (and not do any filtering at all if no kind was passed).
That meant that `x test linkchecker --exclude std` would fail - you had to explicitly say `--exclude test::std`.

Change bootstrap to use the top-level Kind instead, which does the right thing automatically.
Note that this breaks things like `x test --exclude doc::std`, but I'm not sure why you'd ever want to do that.

There's a lot of churn here, but the 1-line change in the first commit is the actual behavior change, the rest is just cleanup.

Fixes https://github.com/rust-lang/rust/issues/103201. Note that this effectively reverts most of https://github.com/rust-lang/rust/pull/91965.

cc `@pietroalbini`

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