fix(core): skip unsafe count optimization for nested predicates

[lokidundun]

Purpose of the PR

• close [Bug] Wrong result for where(count().is() #3085

Main Changes

• Avoid applying HugeCountStrategy to count().is(...) traversals
  containing nested connective predicates.
• Keep the original CountGlobalStep + IsStep traversal for nested
  predicates, so that TinkerPop evaluates the complete predicate tree.
• Preserve the existing optimization for simple predicates and flat
  connective predicates.
• Prevent partially analyzed nested predicates from being transformed
  into RangeGlobalStep or NotStep, which can change or invert the
  filtering semantics.
• Add regression tests for a nested connective predicate and its
  negated form.

Verifying these changes

• Trivial rework / code cleanup without any test coverage. (No Need)
• Already covered by existing tests, such as (please modify tests here).
• Need tests and can be verified as follows:
  • xxx

Does this PR potentially affect the following parts?

• Dependencies (add/update license info & regenerate_known_dependencies.sh)
• Modify configurations
• The public API
• Other affects (typed here)
• Nope

Documentation Status

• Doc - TODO
• Doc - Done
• Doc - No Need