Split change detector action into a separate job, or a separate workflow completely main due to the following reasons:

• the coverage report job does not need to wait for change detector (which takes much longer, and doesn't utilize caching), currently it is blocked when change detector is running.
• extra if statements in the test-and-upload-coverage.yml workflow for a different flow (no code coverage steps).
• test-and-upload-coverage.yml is getting more complex and caching stuff doesn't apply to change detector either.
• optimize change detector when it is it's own job or workflow (perhaps using caching in a different way).