[CI] Update tooling for v3

[cmccandless]

Changed components

• Exercises are no longer in just one directory (exercises/). They are in either exercises/concept/ or exercises/practice/
• Example solutions will now be under a .meta/ directory:
  • practice exercise example files will move from the directory itself (two-fer/example.py) to a new .meta/ directory. Optionally, files can be renamed to proof.py, demo.py, exemplar.py, or stay example.py.
  • concept exercise exemplars are currently located under concept/<exercise-slug>/.meta/exemplar.py (e.gconcept/currency-exchange/.meta/exemplar.py), and will remain there.
• config.json's exercises field is no longer an array of exercises. It is an object with two properties: concept and practice. These each have the same format as the old exercises property.
• Exercise READMEs vary by exercise type.
  • practice exercise READMES follow the conventions listed here
  • concept exercise READMES follow the conventions listed here

Scripts dependent on changes components:

• bin/template_status.py
• bin/generate_tests.py
• test/check-exercises.py

Obsolete scripts

The following scripts are no longer needed:

• bin/check-readmes.sh
• bin/check-test-version.py (versions no longer used in problem-specifications)

Ambiguity

@ErikSchierboom, we have these scripts. Neither are needed for CI, but which (if either) should be kept for contributors/maintainers who need to run the new v3 configlet locally

• bin/fetch-configlet
• bin/fetch-canonical_data_syncer

[cmccandless]

Additionally, it might be easier to maintain our CI workflows if we break out ci-workflow.yml into separate workflow files.

[github-actions]

This issue has been automatically marked as abandoned 🏚 because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions]

This issue has been automatically marked as abandoned 🏚 because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[BethanyG]

Holding open for a bit.

[BethanyG]

@cmccandless - apologies for pinging. Can this be closed, or should I hold it open, but un-assign you?