Add relative path import support for actions directory handler

[willvedd]

🔧 Changes

As reported by #840, actions managed in directory mode produce paths that are relative to the CLI. This is in contrast to other imports, specifically the actions YAML handler, that import relative to the input file. This inconsistency can create confusion and a worse DX for developers unsure how to import code.

The solution here is to add a backup import strategy that targets the action code file relative to the input file. This will ensure backwards compatibility.

📚 References

Related issue: #840

🔬 Testing

Added new test case.

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5ab9ef5) 84.23% compared to head (47bb5d4) 84.23%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #866   +/-   ##
=======================================
  Coverage   84.23%   84.23%           
=======================================
  Files         115      115           
  Lines        3609     3610    +1     
  Branches      699      700    +1     
=======================================
+ Hits         3040     3041    +1     
  Misses        324      324           
  Partials      245      245           

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