Validator comparisons

[davidszotten]

[1.7.x] Fixed #22588 -- Fix RegexValidator __eq__
Compare parameters instead of re.pattern instances, and add the other
parameters to the comparison. Also add a __ne__ to make assertNotEqual
work properly.

[timgraham]

Should we compare the regex's flags as well?

Also please note our commit message guidelines (should start with "Fixed #XXXXX --" and commit message in past tense). Thanks!

[davidszotten]

ah, definitely. and probably inverse_match as well

apologies for commit message and not reading the guidelines properly. figured EAFP :)

is the preference for me to squash all commits on the pr, or to leave multiple commits for review and for you guys to squash on merge?

[timgraham]

For larger patches, separate commits would make reviewing changes easier, but this is small enough I think you can squash commits.