Deny todo!() in tidy

[jdonszelmann]

Implements rust-lang/compiler-team#999

Part of #158173

[rustbot]

Some changes occurred in rustc_ty_utils::consts.rs

cc @BoxyUwU

Some changes occurred in compiler/rustc_builtin_macros/src/autodiff.rs

cc @ZuseZ4

Some changes occurred in compiler/rustc_sanitizers

cc @rcvalle

Some changes occurred in match checking

cc @Nadrieril

Some changes occurred to the CTFE machinery

cc @RalfJung, @oli-obk, @lcnr

This PR changes rustc_public

cc @oli-obk, @celinval, @ouz-a, @makai410

Some changes occurred to the CTFE / Miri interpreter

cc @rust-lang/miri

[rustbot]

r? @Kivooeo

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[rustbot]

This PR changes a file inside tests/crashes. If a crash was fixed, please move into the corresponding ui subdir and add 'Fixes #' to the PR description to autoclose the issue upon merge.

Some changes occurred in coverage tests.

cc @Zalathar

Some changes occurred in GUI tests.

cc @GuillaumeGomez

Some changes occurred in HTML/CSS/JS.

cc @GuillaumeGomez, @lolbinarycat

The parser was modified, potentially altering the grammar of (stable) Rust
which would be a breaking change.

cc @fmease

This PR modifies tests/ui/issues/. If this PR is adding new tests to tests/ui/issues/,
please refrain from doing so, and instead add it to more descriptive subdirectories.

[jdonszelmann]

welp, sorry for the pings yall. no logic changed in y'all's code

[jdonszelmann]

the last few commits change a lot of tidy. ignore-tidy-foo applies only to the next line. If you want file-wide tidy ignores, use ignore-tidy-file-foo

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[Kivooeo]

Ideally, this would be split into two different PRs:

• Add this new directive and move everything to it
• Add a todo check on top of this