fix(config): group-level lint rules calculation

[Sec-ant]

Summary

Correctly calculate enabled rules in lint rule groups.

This is the Karnaugh map of lint group preset logic:

Self (A, R) \ Parent (A, R)	(N, F)	(N, T)	(F, F)	(F, T)	(T, F)	(T, T)
(N, N)	-	R	-	R	A	A
(N, F)	-	-	-	-	A	A
(N, T)	R	R	R	R	A	A
(F, N)	-	R	-	R	-	-
(F, F)	-	-	-	-	-	-
(F, T)	R	R	R	R	R	R
(T, N)	A	A	A	A	A	A
(T, F)	A	A	A	A	A	A
(T, T)	A	A	A	A	A	A

A: all, R: recommended, N: None, T: true, F: false

And the code to implement the above logic is:

  if self.is_all() || self.is_all_unset() && parent_is_all {
      enabled_rules.extend(Self::all_rules_as_filters());
  } else if self.is_recommended() || self.is_recommended_unset() && parent_is_recommended && !parent_is_all {
      enabled_rules.extend(Self::recommended_rules_as_filters());
  }

When calculating the preset rules, we shouldn't populate the disabled rules set, because that will make specific rules cannot be enabled later.

Closes #2191.

Test Plan

Added a test case borrowed from #2191.

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[arendjr]

Thanks for that! Naming is hard, and it's these little touches that can make a difference.

[Sec-ant]

I agree with you but here is a different case. is_not_recommended tests Some(false) while is_recommended_unset tests None. To implement the logic I created the latter one, and the former one is no longer needed in the code, hence the change.

To make the namings more consistent I probably should've renamed is_recommended to is_recommended_true. But as Ema suggests these preset options will be dropped in v2.0 so I didn't touch them.