Load env vars from worker config file into script execution env

[andywaltlova]

HMS-3843

This is aimed to give users possibility to pass additional variables to script execution environment through same config as worker uses.

If rhcd passes additional variables then so be it, these will get appended to the execution environment on top of them.

[r0x0d]

Just a small logging typo

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.88%. Comparing base (a62be18) to head (6aa1fca).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   65.06%   65.88%   +0.82%     
==========================================
  Files           5        5              
  Lines         249      255       +6     
==========================================
+ Hits          162      168       +6     
  Misses         67       67              
  Partials       20       20              

Flag	Coverage Δ
go-1.19	65.88% <100.00%> (+0.82%)	⬆️
go-1.20	65.88% <100.00%> (+0.82%)	⬆️

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