[dx] Deprecate ExplicitBoolCompareRector, as can make less readable if train - array and objects already handled by split rules

[TomasVotruba]

Array and object bool compares have dedicated rules (ArrayExplicitBoolCompareRector, ObjectExplicitBoolCompareRector); the remaining behavior is an opinionated approach that depends on context. Replace the body with a deprecation message, remove its tests, and unregister it from the if set.

Part of splitting the if-set cleanup into focused PRs.

[lode]

I'd like to keep this rule, opinionated maybe. Can't we keep the rule outside the if-set, as something that we can manually add to our rules?

[TomasVotruba]

Ideally, use its version locally and fine tune to your needs.
I'm narrowing rules to anyone can use safely and reducing niche case we tend to ignore.