Omit empty deployment context fields

[sjberman]

Problem: If an optional deployment context field wasn't set, an empty value would still be sent and cause the reporting server to return a 400.

Solution: Use pointers on the optional fields to omit them from the context if they're empty.

Testing: Verified that empty fields in the context still result in a successful report.

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.74%. Comparing base (4cd0621) to head (5f8fbff).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2903   +/-   ##
=======================================
  Coverage   89.74%   89.74%           
=======================================
  Files         109      109           
  Lines       11150    11150           
  Branches       50       50           
=======================================
  Hits        10007    10007           
  Misses       1083     1083           
  Partials       60       60           

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