PP306: Specifies strict config
`--strict-config` should be in `addopts = [...]`. This forces
an error if a config setting is misspelled.

PP307: Specifies strict markers
`--strict-markers` should be in `addopts = [...]`. This forces
all markers to be specified in config, avoiding misspellings.

PP308: Specifies useful pytest summary
An explicit summary flag like `-ra` should be in `addopts = [...]`
(print summary of all fails/errors).

PC191: Ruff show fixes if fixes enabled
If `--fix` is present, `--show-fixes` must be too.

RF003: src directory specified if used
Must specify `src` directory if it exists.

RF103: pyupgrade must be selected
Must select the pyupgrade `UP` checks.