fix: conditional fields perf bug - #2886

[JarrodMFlesch]

Description

Fixes #2886

PR #2856 introduced a bug where conditional fields inside group/tab were causing infinite re-renders and not working correctly for group & tab fields.

In that PR we were attempting to use form state to see if fields have the flag passesCondition on them. We were accessing them via fields[path] but fields such as group/tab do not have form state so they always returned false and the field never rendered.

This PR proposes a different option where we pass a setter/callback function down to <WatchCondition/> and that component will set the internal state on the <WithCondition/> component when it dispatches to form state.

This also fixes a bug where conditions were being called incorrectly inside the fieldReducers 'MODIFY_CONDITION' action. It was passing flattened state but should have been passing the full unflattened object.

• I have read and understand the CONTRIBUTING.md document in this repository

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have added tests that prove my fix is effective or that my feature works
• Existing test suite passes locally with my changes
• I have made corresponding changes to the documentation

[DanRibbens]

LGTM! I haven't pulled it down, but I trust that the new test coverage is sufficient.