Remove entries from the codespell ignore list that do not seem to be
present any more. Also, remove a deliberate typo and instead add a local
annotation to ignore it.
This list is still uncomfortably long, but unfortunately current
versions of codespell do not offer any granularity in between annotating
individual uses (which is not practical in most cases) or globally
ignoring words (which is overly broad and risks missing real errors).
Ignore RunCMake output regexes (i.e. *-stdout.txt, *-stderr.txt) when
checking spelling. Because these are regular expressions, they have a
higher likelihood of having false positives, and because they are
expected output, any text they contain ought to also appear in whatever
code generates it (or else, is probably text that depends on user input
and shouldn't be spell-checked anyway).
In order to share `.codespellrc` between our CI checks and `pre-commit`
checks, we need to match paths without the leading `./`. Convert to a
`bash` script so we can use `dotglob` to pass paths explicitly.
Unfortunately this means we can no longer run `codespell` manually with
no arguments. Instead we can run `.gitlab/ci/codespell.bash`.
