test: expand coverage and add bug fix test

[RyanJWard]

Description

Added tests for product_instance.py and launcher.py using monkeypatch to avoid launching anything.
Also added a bug fix test for a server side change dealing with inserted file id's

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate unit tests.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.68%. Comparing base (bfa184d) to head (f42d5b4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2103      +/-   ##
==========================================
+ Coverage   93.50%   93.68%   +0.18%     
==========================================
  Files         138      138              
  Lines       10156    10156              
==========================================
+ Hits         9496     9515      +19     
+ Misses        660      641      -19     

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[RobPasMue]

Apart from my comment regarding the API to use, all good! Thanks @RyanJWard