migrate github actions to circleci

[raffaele-oplabs]

Description

Migration from .github/workflows/close-stale.yml to circleci.

• removed .github/workflows/close-stale.yml
• added a circleci workflow that call a custom python script that will implement the same functionality. Script reside in a public repo created for this purpose: https://github.com/ethereum-optimism/circleci-utils
• this workflow will be triggered once a day, and will use a custom github token with limited rights, able to only label/close stale issues/PR.
• Removing tag-service in favor of op-workbench for internal use.

Tests

This has not being fully tested in this repo, but it has being partially tested in another repository.

Additional context

Migration to circleci.

Metadata

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.77%. Comparing base (ae78b73) to head (81e929a).
Report is 47 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #12928      +/-   ##
===========================================
- Coverage    68.78%   66.77%   -2.02%     
===========================================
  Files           56       56              
  Lines         4665     4665              
===========================================
- Hits          3209     3115      -94     
- Misses        1274     1378     +104     
+ Partials       182      172      -10     

Flag	Coverage Δ
cannon-go-tests-32	61.81% <ø> (-2.02%)	⬇️
cannon-go-tests-64	56.72% <ø> (-1.66%)	⬇️

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

see 8 files with indirect coverage changes

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