feat: pass the same config with user agent to all plugins

[G-Rath]

I think this will be very useful for #2537 - on its own, it means that all plugins which make external requests will use the configured user agent, though I think in practice that's really just our two transitive enrichers 😅

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.90%. Comparing base (a750891) to head (fbb18c0).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2545      +/-   ##
==========================================
- Coverage   67.92%   67.90%   -0.02%     
==========================================
  Files         172      172              
  Lines       13395    13393       -2     
==========================================
- Hits         9098     9094       -4     
- Misses       3581     3583       +2     
  Partials      716      716              

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