Fix a bug where a constant configuration variable in the common test library
is modified during the test, causing side effects for other tests.
This was found by renaming the tests, which caused other tests to fail.
* Change config entry state to an enum
* Allow but deprecate EntryState str equality comparison
* Test fixes
* Rename to ConfigEntryState
* Remove str comparability backcompat
* Update new occurrences of strs cropped up during review
* Improve error handling user experience
This is meant to make the nest integration quieter. Exceptions are handled with a single log error message.
Co-authored-by: j-stienstra <65826735+j-stienstra@users.noreply.github.com>
