feat(new validate flag): run tests only for source changes

[Rocko1204]

Hi @azlam-abdulsalam

i have decided to use a new flag because it seems that some modes uses the testclass execution.

The new flag is called --runtestagainstsource and depends on --basebranch
Please give my a sign when everything is fine then i can update the docs.

Checklist

All items have to be completed before a PR is merged

• Adhere to Contribution Guidelines
• Updates to Decision Records considered?
• Updates to documentation at flxbl-sfp Guide considered?
• Tested changes?
• Unit Tests new and existing passing locally?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fc5e022) 46.29% compared to head (9be377d) 46.29%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   46.29%   46.29%           
=======================================
  Files          73       73           
  Lines        2817     2817           
  Branches      322      322           
=======================================
  Hits         1304     1304           
  Misses       1488     1488           
  Partials       25       25           

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[azlam-abdulsalam]

This is addressed without a flag in #39