refactor: loggers in webhook handlers

[acpana]

Per a comment made on the stats PR:

#2686 (comment)

this patch primarily adds log objects on the webhook handlers.

[maxsmythe]

Variable renaming makes this PR too verbose to review as-is.

[maxsmythe]

LGTM, assuming the comment about needing to clobber am.log() in the audit manager gets addressed.

[acpana]

hey @ritazh @sozercan this is just a couple of lines to add loggers as member fields for the webhooks; lmk what you think 🙏🏼

[ritazh]

Few nits, otherwise LGTM

[codecov-commenter]

Codecov Report

Patch coverage: 4.76% and project coverage change: -0.08 ⚠️

Comparison is base (f198738) 52.90% compared to head (8a43cea) 52.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2786      +/-   ##
==========================================
- Coverage   52.90%   52.82%   -0.08%     
==========================================
  Files         132      132              
  Lines       11629    11631       +2     
==========================================
- Hits         6152     6144       -8     
- Misses       4999     5008       +9     
- Partials      478      479       +1     

Flag	Coverage Δ
unittests	52.82% <4.76%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/webhook/mutation.go	24.65% <0.00%> (-0.86%)	⬇️
pkg/webhook/policy.go	36.04% <8.33%> (-0.49%)	⬇️

... and 1 file with indirect coverage changes

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