chore: Add defensive exception handling to MassTransitHelpers

[tippmar-nr]

Summary

• Make MassTransitHelpers a static class
• Wrap URI parsing in GetQueueDataFromUri with a try-catch so no exceptions propagate to callers (e.g. relative URIs, malformed percent-encoding). On failure, returns default MassTransitQueueData with "Unknown" queue name.

Test plan

• All 54 existing MassTransitHelperTests pass
• MassTransit and MassTransitLegacy wrapper projects build cleanly

[codecov-commenter]

Codecov Report

❌ Patch coverage is 78.37838% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.79%. Comparing base (62bdb44) to head (e2100ac).

Files with missing lines	Patch %	Lines
...s/NewRelic.Agent.Extensions/Helpers/MassTransit.cs	78.37%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3532   +/-   ##
=======================================
  Coverage   81.79%   81.79%           
=======================================
  Files         508      508           
  Lines       34365    34369    +4     
  Branches     4067     4067           
=======================================
+ Hits        28108    28112    +4     
- Misses       5285     5288    +3     
+ Partials      972      969    -3     

Flag	Coverage Δ
Agent	82.78% <78.37%> (+<0.01%)	⬆️
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
...s/NewRelic.Agent.Extensions/Helpers/MassTransit.cs	86.25% <78.37%> (-1.93%)	⬇️

... and 1 file with indirect coverage changes

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[jaffinito]

LGTM