mergestate: merge `preresolve()` into `resolve()`
The separation between `preresolve()` and `resolve()` was something
added for the "merge driver" feature. Since we removed that in
32ce4cbaec4b (mergedriver: delete it, 2020-09-17), we don't need the
separation anymore. More cleanups will follow.
Differential Revision: https://phab.mercurial-scm.org/D11855
Our full contribution guidelines are in our wiki, please see:
https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).