update RTD config, move doc deps into their own group, update dev group

[ITProKyle]

What Changed

Added

• (actions) added info job to the CI/CD workflow
  • uses github context to provide outputs that can be used to simplify conditionally skipping jobs
  • these outputs replace and improve some of the conditions used by the test-functional and deploy-test-infrastructure jobs as these are unable to run when a PR is opened from a fork because they require secrets

Changed

• (pyproject.toml) renamed [tool.poetry.dev-dependencies] table to [tool.poetry.group.dev.dependencies]
  • new notation added in poetry >= 1.2.0 (source)
  • old notation will be deprecated in a future release
• (pyproject.toml) moved documentation dependencies out of the main dependency group into the docs dependency group ([tool.poetry.group.docs.dependencies] table)
  • updated Makefile accordingly to remove --extras flag
• (pyproject.toml) moved boto3-stubs & mypy-boto3 out of the dev dependency group into the types dependency group to better reflect what they are being installed for
• (.readthedocs.yml) updated config to use the documented method to Install dependencies with Poetry
  • python version used to build documentation was also bumped when updating the config
• (actions) removed uses of --extras docs
• (actions) the Spell Check workflow will not trigger for pull requests and pushes to the master branch rather than only for pushes to all branches
  • this mirrors the triggering events of the CI/CD workflow
  • could be the cause of the PR becoming stuck waiting for the Spell Check workflow to run/report status as this PR is opened from a fork which does not run actions by default

[alexander-kogan]

LGTM

[ITProKyle]

codecov failure is a known bug in the current version of the action when creating a PR from a fork - codecov/codecov-action#1487

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.18%. Comparing base (65d6882) to head (72a3712).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2381   +/-   ##
=======================================
  Coverage   90.18%   90.18%           
=======================================
  Files         247      247           
  Lines       15677    15677           
=======================================
  Hits        14138    14138           
  Misses       1539     1539           

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