Auto merge of #99603 - fasterthanlime:ra-subtree-2, r=jyn514

Convert rust-analyzer to an in-tree tool

This re-adds `rust-lang/rust-analyzer` as a git subtree rather than a submodule.

Closes https://github.com/rust-lang/rust-analyzer/issues/12815.

Prior attempt (research PR): https://github.com/rust-lang/rust/pull/99465

  * [x] Remove submodule: `git rm -f src/tools/rust-analyzer`
  * [x] Add subtree: `git subtree add -P src/tools/rust-analyzer https://github.com/rust-lang/rust-analyzer.git master`
  * [x] Move to `SourceType::InTree`,
  * [x] Enable `rust-analyzer/in-rust-tree` feature when built through `x.py`
  * [x] Add 'check' step
  * [x] Add 'test' step

With this PR, rust-analyzer becomes an "in-tree" tool. Syncs can happen in both directions, see [clippy's relevant book section](https://doc.rust-lang.org/nightly/clippy/development/infrastructure/sync.html).

Making sure `proc-macro-srv` doesn't break when the proc_macro bridge changes effectively becomes the responsibility of `rust-lang/rust` contributors. These days, that's mostly `@mystor,` who has been consulted throughout the process. I'm also making myself available in case there's questions / work needed that nobody else signed up for.

This doesn't change rust-analyzer's release cycle. After this PR is merged and the next nightly goes out, one can point `rust-analyzer.procMacro.server` to the rustup-provided `rust-analyzer` binary. Changes to improve the situation further (auto-discovery/install of the rust-analyzer component) will happen in `rust-lang/rust-analyzer` and be synced here eventually.

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