Jetty12 core server transactions

[jbedell-newrelic]

Start transactions inside the core Jetty server (rather than just servlets).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.66%. Comparing base (5dcd0a8) to head (99e7120).
Report is 426 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1950      +/-   ##
============================================
- Coverage     70.66%   70.66%   -0.01%     
+ Complexity     9858     9857       -1     
============================================
  Files           826      826              
  Lines         39804    39792      -12     
  Branches       6062     6061       -1     
============================================
- Hits          28127    28118       -9     
+ Misses         8951     8948       -3     
  Partials       2726     2726              

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[obenkenobi]

This did not break async transaction tests, good work!