Create group containing all Rust 2021 edition lints

[nikomatsakis]

As follow up to #85512, we need to create a group containing all "Rust 2021 migration"-related lints. Let's start by logging them in the comments here.

[nikomatsakis]

This isn't really blocked on #85512, it's just not as useful without it.

[m-ou-se]

1. Prelude changes:
   • future_prelude_collision (Add future_prelude_collision lint #85707)
2. Panic consistency:
   • non_fmt_panic (Turn non_fmt_panic into a future_incompatible edition lint. #86671)
3. Lints -> hard errors
   • bare_trait_objects
   • ellipsis_inclusive_range_patterns
4. Disjoint captures
   • disjoint_capture_migration (Make disjoint_capture_migration an edition lint. #86673)
5. Cargo resolver 2
   • No lint. Already built into cargo fix --edition: Add report if cargo fix --edition changes features. cargo#9268
6. IntoIterator for arrays
   • array_into_iter
7. Or patterns
   • or_patterns_back_compat
8. Reserving syntax
   • reserved_prefix (Reserve prefixed identifiers and literals (RFC 3101) #85359)

[rylev]

@rustbot claim

[inquisitivecrystal]

Sigh. I apologize for the double message (now deleted). Messed up the command format, and then I couldn't tell why it wasn't working.

@rustbot label +A-lint +T-compiler