Rollup merge of #110365 - ozkanonur:ship-tools-with-sysroot, r=jyn514

ship tools with sysroot

Provides tool binaries under the sysroot which can be used/tested with `cargo +custom-toolchain $tool`

Clippy and fmt works without any problem.

But can't say the same for miri:

```sh
  ~/devspace/.other/chunk-list  stable $ cargo +stage2 miri setup
Running `"rustup" "component" "add" "rust-src"` to install the `rust-src` component for the selected toolchain.
error: stage2 is a custom toolchain
fatal error: failed to install the `rust-src` component for the selected toolchain
```

it's looking for `$sysroot/lib/rustlib/src/rust/library` and that simply doesn't exists for `x build`.

cc `@jyn514` (I thought you might be interested on this, since you did few review iterations on previous PRs of adding tools to sysroot)

--

**Update**

Now we are able to use `miri` as well.

After running `x b miri cargo-miri --stage 2`, I am able to run `cargo +stage2 miri setup` which works as expected.

Resolves #110625
Resolves #97762
Resolves #81431

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