…ements, r=wesleywiser

Improve cfg and check-cfg configuration

This PR improves cfg and check-cfg configuration by:
 1. Extracting both logic under a common module (to improve the connection between the two)
 2. Adding more documentation, in particular some steps when adding a new cfg

I also added my-self as mention in our triagebot conf for the new module.

Inspired by rust-lang#123411 (comment)

Rollup merge of rust-lang#123519 - Urgau:session-cfg-check-cfg-improvements, r=wesleywiser

Improve cfg and check-cfg configuration

This PR improves cfg and check-cfg configuration by:
 1. Extracting both logic under a common module (to improve the connection between the two)
 2. Adding more documentation, in particular some steps when adding a new cfg

I also added my-self as mention in our triagebot conf for the new module.

Inspired by rust-lang#123411 (comment)

…llaumeGomez

Rollup of 4 pull requests

Successful merges:

 - rust-lang#119224 (Drop panic hook after running tests)
 - rust-lang#123411 (Put checks that detect UB under their own flag below debug_assertions)
 - rust-lang#123446 (Fix incorrect 'llvm_target' value used on watchOS target)
 - rust-lang#123516 (Do not ICE on field access check on expr with `ty::Error`)

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

…iaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#119224 (Drop panic hook after running tests)
 - rust-lang#123411 (Put checks that detect UB under their own flag below debug_assertions)
 - rust-lang#123516 (Do not ICE on field access check on expr with `ty::Error`)
 - rust-lang#123522 (Stabilize const Atomic*::into_inner)
 - rust-lang#123559 (Add a debug asserts call to match_projection_projections to ensure invariant)
 - rust-lang#123563 (Rewrite `version` test run-make as an UI test)

Failed merges:

 - rust-lang#123569 (Move some tests)

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