Add support for canceling requests

[jamacku]

Related to:

• RFE: Cancel Action run when the newer request was received; Consume fewer GitHub/TF resources sclorg/testing-farm-as-github-action#119

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (8502c65) 98.75% compared to head (6a2bf6e) 98.16%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
src/index.ts	81.25%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   98.75%   98.16%   -0.59%     
==========================================
  Files           4        4              
  Lines         403      437      +34     
  Branches       30       34       +4     
==========================================
+ Hits          398      429      +31     
- Misses          5        8       +3     

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