fix: Fixed issue parsing docker container id

[jsumners-nr]

This PR fixes an issue where we failed to parse a Docker container id from the cgroups v1 file when the cgroups v2 file is also present.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.19%. Comparing base (9e98b18) to head (a585016).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2705       +/-   ##
===========================================
+ Coverage   79.26%   97.19%   +17.93%     
===========================================
  Files         284      294       +10     
  Lines       44940    46125     +1185     
===========================================
+ Hits        35621    44833     +9212     
+ Misses       9319     1292     -8027     

Flag	Coverage Δ
integration-tests-cjs-18.x	74.28% <100.00%> (?)
integration-tests-cjs-20.x	74.30% <100.00%> (?)
integration-tests-cjs-22.x	74.33% <100.00%> (?)
integration-tests-esm-18.x	49.89% <0.00%> (-0.03%)	⬇️
integration-tests-esm-20.x	49.90% <0.00%> (-0.03%)	⬇️
integration-tests-esm-22.x	49.93% <0.00%> (-0.03%)	⬇️
unit-tests-18.x	88.97% <71.42%> (?)
unit-tests-20.x	88.97% <71.42%> (?)
unit-tests-22.x	88.98% <71.42%> (?)
versioned-tests-18.x	78.95% <0.00%> (-0.22%)	⬇️
versioned-tests-20.x	78.95% <0.00%> (-0.23%)	⬇️
versioned-tests-22.x	78.98% <0.00%> (-0.20%)	⬇️

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