Remove enumerations from stats_enums.hpp that are not used

[RickiNano]

Clean up enumerations that are no longer in use. This pr targets #4102

[gr0vity-dev]

I'm wondering if it makes sense to have enums that are only used in the testcases ?
Do they make sense in a testcase when the codebase doesn't use them ?

Looking at the vote_processed enum, it got removed with the Optimistic elections PR in these commits :
e1c893b7dcbcfd9cf53eb1b0239e9febc62bb508
62811054380185c376df600501d22101b389d975

[clemahieu]

I'm wondering if it makes sense to have enums that are only used in the testcases ? Do they make sense in a testcase when the codebase doesn't use them ?

Looking at the vote_processed enum, it got removed with the Optimistic elections PR in these commits : e1c893b7dcbcfd9cf53eb1b0239e9febc62bb508 62811054380185c376df600501d22101b389d975

That is a good point and really I agree. It's occurred to me that we shouldn't be checking counters in tests at all. The stat counters are for users, and just as we shouldn't be depending on the output of logs, we shouldn't be depending on the counters.

[RickiNano]

Do you want me to remove the enums again, and also remove the unit tests they are used in?

[clemahieu]

No, let's do that separately. This change is fine on its own to remove enums that are completely unused.