Add endpoint with enabled state

[sonjaer]

Hey, I just made a Pull Request!

Description

There is no endpoint for quickly getting all workflows enabled state. This PR adds it.

Motivation and Context

Currently you need to make one request per workflow which takes a long time. Since we are making some changes internally it would be good to store this information to be able to recover it.

Have you tested this? If so, how?

I have included unit tests

Checklist for PR author(s)

• [x] Changes are covered by unit test
• [x] All tests pass
• [x] Code coverage check passes
• [x] Error handling is tested
• [x] Errors are handled at the appropriate layer
• [x] Errors that cannot be handled where they occur are propagated
• [ ] (optional) Changes are covered by system test
• [ ] Relevant documentation updated
• [x] This PR has NO breaking change to public API
• [x] This PR has breaking change to public API and it is documented

Checklist for PR reviewer(s)

• [ ] This PR has been incorporated in release note for the coming version
• [ ] Risky changes introduced by this PR have been all considered

[codecov[bot]]

Codecov Report

Merging #1056 (196f406) into master (35c827c) will decrease coverage by 0.05%. The diff coverage is 76.19%.

@@             Coverage Diff              @@
##             master    #1056      +/-   ##
============================================
- Coverage     92.40%   92.36%   -0.05%     
- Complexity     2145     2150       +5     
============================================
  Files           200      200              
  Lines          8293     8314      +21     
  Branches        502      502              
============================================
+ Hits           7663     7679      +16     
- Misses          517      521       +4     
- Partials        113      114       +1