Ambient-toolbox

* Handled NullPointer in GitLab coverage script

* Fixed wrong path in validator documentation
* Added missing German translation

* Added auth password validator for special chars `SpecialCharValidator`

* Fixed crash in GitLab coverage service due to `check=True`

* Added migration docs to Readme
* Added migration check to GitHub actions
* Switched formatter from `black` to `ruff`
* Enforcing minimum coverage in CI/CD pipeline
* Further updates from ambient updater package
* Updated GitHub action versions
* Fixes typos

* Coverage service fixed crash on zero pipelines
* Added default `develop` for `GITLAB_CI_COVERAGE_TARGET_BRANCH` in GitLab coverage service