Make loggers static or move into anonymous namespace

[sjahr]

Description

Small cleanup for const Loggers

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9952bdd) 50.52% compared to head (be9a71f) 50.52%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2184   +/-   ##
=======================================
  Coverage   50.52%   50.52%           
=======================================
  Files         387      387           
  Lines       31719    31719           
=======================================
  Hits        16024    16024           
  Misses      15695    15695           

Impacted Files	Coverage Δ
...ics_plugin_loader/src/kinematics_plugin_loader.cpp	78.69% <ø> (ø)

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