- Address Call for Testing review feedback
- Address Affiliated work review feedback
- Drop "stabilization is easy" part
- Fix broken feature gate examples
- Elaborate on stabilization report summarization aspects
- Recommend waiting a bit for team nominations
- Make Stabilization Template markdown copy friendly
- Register stabilization report template
- Drop unfinished sentence
- Clarify stabilization report template is for language features
- Add test coverage elaboration
- Add UB checks / opt question
- Amend test coverage explanation
- Mention OSS nightly users

Let's revise both the new content in this PR as well as the remaining
text in the relevant chapters so as to better describe our current
processes related to language features and their stabilizations.

For the new stabilization report template, based on reviewing its
early use and well as reviewing earlier stabilization reports, we've
revised it editorially and added questions designed to capture
additional details to which we commonly want people to speak.

cleaning some "error pattern" text

Rollup of 11 pull requests

Successful merges:

 - #143289 (Remove `[T]::array_chunks(_mut)`)
 - #143883 (Add `--link-targets-dir` argument to linkchecker)
 - #144034 (tests: Test line number in debuginfo for diverging function calls)
 - #144236 (Add `core::mem::DropGuard`)
 - #144268 (Add method `find_ancestor_not_from_macro` and `find_ancestor_not_from_extern_macro` to supersede `find_oldest_ancestor_in_same_ctxt`)
 - #144303 (Consolidate staging for `rustc_private` tools)
 - #144539 (constify with_exposed_provenance)
 - #144569 (rustc-dev-guide subtree update)
 - #144573 (Raw Pointers are Constant PatKinds too)
 - #144578 (Ensure correct aligement of rustc_hir::Lifetime on platforms with lower default alignments.)
 - #144582 (fix `Atomic*::as_ptr` wording)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup of 11 pull requests

Successful merges:

 - #143883 (Add `--link-targets-dir` argument to linkchecker)
 - #144236 (Add `core::mem::DropGuard`)
 - #144303 (Consolidate staging for `rustc_private` tools)
 - #144367 (Move dist-apple-various from x86_64 to aarch64)
 - #144539 (constify with_exposed_provenance)
 - #144569 (rustc-dev-guide subtree update)
 - #144573 (Raw Pointers are Constant PatKinds too)
 - #144575 (fixed typo chunks->as_chunks)
 - #144578 (Ensure correct aligement of rustc_hir::Lifetime on platforms with lower default alignments.)
 - #144582 (fix `Atomic*::as_ptr` wording)
 - #144616 (coverage: Regression test for "function name is empty" bug)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup of 10 pull requests

Successful merges:

 - #143883 (Add `--link-targets-dir` argument to linkchecker)
 - #144236 (Add `core::mem::DropGuard`)
 - #144367 (Move dist-apple-various from x86_64 to aarch64)
 - #144539 (constify with_exposed_provenance)
 - #144569 (rustc-dev-guide subtree update)
 - #144573 (Raw Pointers are Constant PatKinds too)
 - #144575 (fixed typo chunks->as_chunks)
 - #144578 (Ensure correct aligement of rustc_hir::Lifetime on platforms with lower default alignments.)
 - #144582 (fix `Atomic*::as_ptr` wording)
 - #144616 (coverage: Regression test for "function name is empty" bug)

r? `@ghost`
`@rustbot` modify labels: rollup