fix: Send loaded modules on agent reconnect

[nr-ahemsath]

Description

The agent spec for the update_loaded_modules endpoint requires the agent to resend the entire list of loaded modules if the agent reconnects. We weren't doing that; this fixes it. In addition to the unit test, I verified this manually by triggering an agent reconnect by changing the log level of a running agent from INFO to DEBUG and verified that, after the reconnect, the entire list of loaded modules was sent to New Relic.

Author Checklist

• Unit tests, Integration tests, and Unbounded tests completed
• Performance testing completed with satisfactory results (if required)

Reviewer Checklist

• Perform code review
• Pull request was adequately tested (new/existing tests, performance tests)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.81%. Comparing base (597e65b) to head (5f62101).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3534      +/-   ##
==========================================
+ Coverage   81.79%   81.81%   +0.01%     
==========================================
  Files         508      508              
  Lines       34369    34383      +14     
  Branches     4067     4067              
==========================================
+ Hits        28112    28130      +18     
+ Misses       5288     5284       -4     
  Partials      969      969              

Flag	Coverage Δ
Agent	82.80% <100.00%> (+0.02%)	⬆️
Profiler	71.75% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...gent/Core/Utilities/UpdatedLoadedModulesService.cs	93.47% <100.00%> (+2.56%)	⬆️

... and 2 files with indirect coverage changes

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