Add the region flag to the imagebuilder component custom script download action

[dreambeyondorange]

Tests

• Ran integ tests locally for createami custom component

References

• Link to impacted open issues.
• Link to related PRs in other packages (i.e. cookbook, node).
• Link to documentation useful to understand the changes.

Checklist

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• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.21%. Comparing base (c3154c1) to head (3aa2c68).
Report is 19 commits behind head on release-3.10.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-3.10    #6425   +/-   ##
=============================================
  Coverage         90.20%   90.21%           
=============================================
  Files               181      181           
  Lines             15898    15901    +3     
=============================================
+ Hits              14341    14345    +4     
+ Misses             1557     1556    -1     

Flag	Coverage Δ
unittests	90.21% <100.00%> (+<0.01%)	⬆️

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