Fix Session.Save to only save specified subscriptions

[tobiasfrick]

Proposed changes

Fixes a bug in Session.Save().
The method was ignoring the subscriptions parameter and instead always saved all subscriptions from the session.

• Changed the foreach loop to iterate over the subscriptions parameter instead of this.Subscriptions
• Added a unit test that verifies only the specified subscriptions are saved when a subset is provided

Related Issues

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which adds functionality)
• Test enhancement (non-breaking change to increase test coverage)
• Breaking change (fix or feature that would cause existing functionality to not work as expected, requires version increase of Nuget packages)
• Documentation Update (if none of the other choices apply)

Checklist

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• I have signed the CLA.
• I ran tests locally with my changes, all passed.
• I fixed all failing tests in the CI pipelines.
• I fixed all introduced issues with CodeQL and LGTM.
• I have added tests that prove my fix is effective or that my feature works and increased code coverage.
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• Any dependent changes have been merged and published in downstream modules.

Further comments

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.12%. Comparing base (d25caff) to head (fba9b58).
⚠️ Report is 75 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3446      +/-   ##
==========================================
+ Coverage   51.86%   60.12%   +8.25%     
==========================================
  Files         370      377       +7     
  Lines       78618    78643      +25     
  Branches    13650    13710      +60     
==========================================
+ Hits        40779    47287    +6508     
+ Misses      33705    26998    -6707     
- Partials     4134     4358     +224     

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[romanett]

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