* fix and test bug in config env loading
* streamline env var interpretation with @adhami3310
* improve error messages, fix invalid value for TELEMETRY_ENABLED
* just a small hint
* ruffing
* fix typo from review
* refactor - ruff broke the imports..
* cleanup imports
* more
* add internal and enum env var support
* ruff cleanup
* more global imports
* revert telemetry, it lives in rx.Config
* minor fixes/cleanup
* i missed some refs
* fix darglint
* reload config is internal
* fix EnvVar name
* add test for EnvVar + minor typing improvement
* bool tests
* was this broken?
* retain old behavior
* migrate APP_HARNESS_HEADLESS to new env var system
* migrate more APP_HARNESS env vars to new config system
* migrate SCREENSHOT_DIR to new env var system
* refactor EnvVar.get to be a method
* readd deleted functions and deprecate them
* improve EnvVar api, cleanup RELOAD_CONFIG question
* move is_prod_mode back to where it was
4a6c16e9dc