Several minor fixes

[shameekganguly]

• Copy source in ServerConfigPrivate copy constructor
• Add anonymous namespace around helper function in ServerConfig.cc
• Change remaining ign log macros to gz macros
• Fix an incorrect IsEnabled call in buoyancy system
• Directly add a few transitively added headers in performer_detector and multicopter_velocity_control systems
• Add missing header in test/test_config.hh.in
• Fix path comparison in src/SystemLoader_TEST.cc for bazel

[codecov]

Codecov Report

Merging #2027 (1e5b6f8) into gz-sim7 (3bde4b5) will increase coverage by 0.01%.
The diff coverage is 50.00%.

❗ Current head 1e5b6f8 differs from pull request most recent head dfebde4. Consider uploading reports for the commit dfebde4 to get more accurate results

@@             Coverage Diff             @@
##           gz-sim7    #2027      +/-   ##
===========================================
+ Coverage    64.98%   64.99%   +0.01%     
===========================================
  Files          353      353              
  Lines        28600    28619      +19     
===========================================
+ Hits         18585    18602      +17     
- Misses       10015    10017       +2     

Impacted Files	Coverage Δ
.../plugins/component_inspector/ComponentInspector.cc	5.61% <0.00%> (ø)
src/rendering/RenderUtil.cc	39.03% <0.00%> (ø)
src/rendering/SceneManager.cc	30.90% <0.00%> (ø)
src/systems/buoyancy/Buoyancy.cc	82.25% <0.00%> (ø)
.../systems/environment_preload/EnvironmentPreload.cc	69.69% <0.00%> (ø)
.../multicopter_control/MulticopterVelocityControl.hh	100.00% <ø> (ø)
...rc/systems/performer_detector/PerformerDetector.hh	100.00% <ø> (ø)
src/systems/sensors/Sensors.cc	62.74% <ø> (ø)
src/systems/thruster/Thruster.cc	86.20% <0.00%> (ø)
src/systems/hydrodynamics/Hydrodynamics.cc	85.28% <50.00%> (ø)
... and 5 more

... and 3 files with indirect coverage changes

[arjo129]

Thanks for these changes. LGTM.