Remove `BuiltinLintDiag`#154912

Merged

rust-bors[bot] merged 4 commits into

rust-lang:mainfrom

GuillaumeGomez:migrate-diag

Apr 9, 2026

rust-bors / Bors try build succeeded Apr 6, 2026 in 2h 12m 17s

Bors try build

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