[rustdoc] Correctly handle should_panic doctest attribute and fix --no-run test flag on the 2024 edition
#148444
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Fixes #143009.
Fixes #143858.
Supersedes #143900 and #147674.
Unlike #147674, this one doesn't try to fix
should_panicfor non-merged (ie pre-2024 edition orstandalone) doctests.For
--no-run, we forgot to check the "global" options in the 2024 edition, fixed in the first commit.For
should_panicfix, the exit code check has been fixed.r? @fmease