refactor (backend): move config files out of the source directories (#9769)

* moving config files out of the source directories
Fixes #9756

* add folder for config

* fix lookup paths

* reorder ignores

* reduce diff

* better error message

* fix paths

* Update tests.py

* save global warning to db

* fix import

* more import fixes / docs

* fix default

* fix default

* ensure secret_key/get_config_file is tested fully

* try fixing path on docker

* try to make it work on GitHub CI

* refactor testfolder path into config var

* fix test path

* fix test

* do not test on docker

* more tests

* add testing for global warning dict

* fix error handling

config/.gitignore

@@ -0,0 +1 @@
+*