add all ci provider names to the choices of --auto-load-from option

[dana-yaish]

add all ci provider names to the choices of --auto-load-from option + cleaning code

[codecov]

Codecov Report

Merging #83 (d78a77c) into master (c933558) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
+ Coverage   95.55%   95.65%   +0.09%     
==========================================
  Files          45       45              
  Lines        1305     1335      +30     
==========================================
+ Hits         1247     1277      +30     
  Misses         58       58              

Flag	Coverage Δ
cli3.10	?
python3.10	95.65% <100.00%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
codecov_cli/helpers/ci_adapters/appveyor_ci.py	100.00% <100.00%> (ø)
codecov_cli/helpers/ci_adapters/azure_pipelines.py	100.00% <100.00%> (ø)
codecov_cli/helpers/ci_adapters/bitbucket_ci.py	100.00% <100.00%> (ø)
codecov_cli/helpers/ci_adapters/bitrise_ci.py	100.00% <100.00%> (ø)
codecov_cli/helpers/ci_adapters/buildkite.py	100.00% <100.00%> (ø)
codecov_cli/helpers/ci_adapters/circleci.py	100.00% <100.00%> (ø)
codecov_cli/helpers/ci_adapters/cirrus_ci.py	100.00% <100.00%> (ø)
codecov_cli/helpers/ci_adapters/droneci.py	100.00% <100.00%> (ø)
codecov_cli/helpers/ci_adapters/github_actions.py	100.00% <100.00%> (ø)
codecov_cli/helpers/ci_adapters/gitlab_ci.py	100.00% <100.00%> (ø)
... and 6 more

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