Try alternative strategy for extracting tags

[adamrtalbot]

This PR introduces the new strategy pioneered by @CarsonJM to the nf-core/modules repo.

Steps:

1. adamrtalbot/detect-nf-changes to identify the changes between the base and incoming branch and return them as tests to be ran.
2. Split into module and subworkflow channel (heh x2)
3. Combine modules channel from pytest and nf-test and run linting as a matrix nf-core modules lint ${module}
4. Combine subworkflows channel from pytest and nf-test and run linting as a matrix nf-core subworkflows lint ${module}
5. Combine modules and subworkflows channel and run pytest as a matrix pytest --tag ${module}
6. Combine modules and subworkflows channel from nf-test-changes and run nf-test as a matrix nf-test test ${path}