gh-159486: Set issuperset nested lock

[johng]

• Issue: Nested lock in set.issuperset #159486

[picnixz]

Are there othre places in the code where we have that useless double locking (not just limited to set, but limited to methods that do @critical_section and invoke another method that also does @critical_section?)

[johng]

This came about from some sweeping research with claude but nothing else significant was found but I can try again focusing on the critical section tags.

[picnixz]

If possible, please do so. That way we can just fix this in one go. If there are too many files, we can make focused PRs, but for mechanical changes like this, it's sometimes better to search beyond the scope of the file.

[johng]

#159559 for 5 found items which also seemed like low hanging fruit