Partial libs team refactor: merge libs and libs-api, don't move libs-contributors into libs yet

[clarfonthey]

Was a request from @Mark-Simulacrum.

Essentially, this is #2651 without the merging of libs-contributors into libs, which is blocked by removing team access to crates for libs. It does technically give access to two additional people for these crates (BurntSushi and dtolnay) as they were only part of libs-api before, but this is fine comparing to giving 21 additional people access (assuming I counted right).

[Mark-Simulacrum]

Hm, I was expecting just the crates.io permission removals -- I think that's the only piece that needs doing before we can just merge the other PR? I guess we can merge this though since it's a more minimal expansion in practice...

[github-actions]

Dry-run check results

[WARN  rust_team::sync] sync-team is running in dry mode, no changes will be applied.
[INFO  rust_team::sync] synchronizing crates-io
[INFO  rust_team::sync] synchronizing github
[INFO  rust_team::sync] 💻 Team Diffs:
    📝 Editing team 'rust-lang/libs':
      Adding member 'BurntSushi' with member role
      Adding member 'dtolnay' with member role
    📝 Editing team 'rust-lang-nursery/libs':
      Adding member 'BurntSushi' with member role
      Adding member 'dtolnay' with maintainer role
    ❌ Deleting team 'rust-lang/libs-api'
    ❌ Deleting team 'rust-lang-nursery/libs-api'
    💻 Repo Diffs:
    📝 Editing repo 'rust-lang/api-guidelines':
      Permission Changes:
        Removing team 'libs-api''s write permission 
    📝 Editing repo 'rust-lang/enzyme':
      Permission Changes:
        Removing team 'libs-api''s maintain permission 
    📝 Editing repo 'rust-lang/goals':
      Permission Changes:
        Removing team 'libs-api''s maintain permission 
    📝 Editing repo 'rust-lang/libs-team':
      Permission Changes:
        Removing team 'libs-api''s maintain permission 
    📝 Editing repo 'rust-lang/packed_simd':
      Permission Changes:
        Removing team 'libs-api''s write permission 
    📝 Editing repo 'rust-lang/rust':
      Permission Changes:
        Removing team 'libs-api''s write permission 
    📝 Editing repo 'rust-lang/rust-forge':
      Permission Changes:
        Removing team 'libs-api''s maintain permission 
    📝 Editing repo 'rust-lang/rustc-dev-guide':
      Permission Changes:
        Removing team 'libs-api''s write permission 
    📝 Editing repo 'rust-lang/std-dev-guide':
      Permission Changes:
        Removing team 'libs-api''s write permission 
    📝 Editing repo 'rust-lang/stdarch':
      Permission Changes:
        Removing team 'libs-api''s write permission 
    📝 Editing repo 'rust-lang/wg-allocators':
      Permission Changes:
        Removing team 'libs-api''s write permission 

[clarfonthey]

Sure: #2684