Fix linter errors in higher-level packages #4860
Merged
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Fix the remaining linter errors in packages that won't cause a rebuild of the entire software stack.
Also fix linter warnings in the same packages, as the package hashes will change anyway, and this way the warnings won't suddenly crop up the next time anyone sends a PR including these packages.
Also delete parquet-cpp recipe; see 0bacb34 for details.
Draft to avoid too many rebuilds in CI.
Needed for #4730.