parser: Remove old diagnostic notes for type ascription syntax Type ascription syntax was removed by #109128 in 2023, so “remove this again in a few months” is long overdue. Happily, this also reduces the amount of parser diagnostic code that cares whether the compiler is unstable. --- See also the recent #138898, which removed some other related dead code but declined to touch the diagnostics. It's possible that some of these parser tests are no longer useful at all, but I haven't investigated them for this PR.
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