fix: `update`, `add` and `remove` with `--only` shall not uninstall...

fix: `update`, `add` and `remove` with `--only` shall not uninstall dependencies from all other groups

Reintroduce some logic removed in bd3500d07cd0ab0d10d26917fdda3abdd8e67704 and add tests for it.
Fix logic with `reresolve = False`, which had the same issue.

- The change in installer is the fix for `reresolve = True` (reintroducing old logic).
- The change in transaction is the fix for `reresolve = False`.