This is a little too picky, even for us.

Cops with a max level are auto-generated with that set to the current
maximum, even when they're supposed to be ignored. For now, the best
option is to manually disable them.

`Style/VariableNumber` is explicitly disabled because I don't think we
care if we name a variable `var_1` or `var1`.

Avoid multi-line ?: (the ternary operator). Use if/unless instead.

See #17478

This enables following cops:

Check for useless access modifiers

  Lint/UselessAccessModifier

Checks for attempts to use `private` or `protected` to set the
visibility of a class method, which does not work.

  Lint/IneffectiveAccessModifier

This also disables two false possitives in concerns.