Add to source control no longer fails for non-host PTD items

[isc-pbarton]

Description

Resolves #965
When exporting .PTD documents we were assuming they were always decomposed production items following our naming standard. Now we add a check on the internal name. Non-host PTD items fall back to our generic logic for custom studio documents, so they will be exported with file extension .PTD.

Testing

Unit test covers adding to source control and naming logic.

Checklist

• This branch has the latest changes from the main branch rebased or merged.
• Web UI has been built (any changes in git-webui/src have matching changes in git-webui/release)
• CHANGELOG.md entry added if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.10%. Comparing base (c0d7b72) to head (dfe8e8d).

Files with missing lines	Patch %	Lines
cls/SourceControl/Git/Utils.cls	40.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #968   +/-   ##
=======================================
  Coverage   49.10%   49.10%           
=======================================
  Files          23       23           
  Lines        3287     3291    +4     
=======================================
+ Hits         1614     1616    +2     
- Misses       1673     1675    +2     

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