Separate CI workflows

[amrit110]

PR Type ([Feature | Fix | Documentation | Test])

CI

Short Description

Currently the CI workflows are taking too much time. These are mainly the docs (build) and docs deploy workflows. The time consumed is mainly from running the notebook tutorials. In this PR we improve this situation by:

1. Separating out the unit tests and coverage calculation into a normal unit test workflow
2. Creating a single workflow for building docs and deploying them. This was achieved using event trigger if statements. This workflow does not run the nbsphinx notebooks.
3. Creating a new separate workflow which only runs for release PRs (looks at the release label). It also deploys to github pages once the PR is merged.

Also changed the docs and release docs workflows to run in the github CI runner. So, only the integration tests run on the self-hosted runner.

Tests Added

...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.27%. Comparing base (40a7c21) to head (9af671d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #645   +/-   ##
=======================================
  Coverage   75.27%   75.27%           
=======================================
  Files         128      128           
  Lines       11473    11473           
=======================================
  Hits         8636     8636           
  Misses       2837     2837           

see 1 file with indirect coverage changes