add app: webhook label to webhook service

[JordanDeBeer]

Fixes #

Proposed Changes

• Add an app label to the webhook service. This aligns with the other component services (activator, controller).

Release Note

Label the webhook service with "app: webhook" label

[linux-foundation-easycla]

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• ✅ login: JordanDeBeer / name: Jordan DeBeer (c6b5bca)

[knative-prow]

Welcome @JordanDeBeer! It looks like this is your first PR to knative/serving 🎉

[knative-prow]

Hi @JordanDeBeer. Thanks for your PR.

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[dprotaso]

/ok-to-test
/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, JordanDeBeer

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.03% ⚠️

Comparison is base (ece2fea) 86.28% compared to head (c6b5bca) 86.26%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14258      +/-   ##
==========================================
- Coverage   86.28%   86.26%   -0.03%     
==========================================
  Files         199      199              
  Lines       14811    14811              
==========================================
- Hits        12780    12776       -4     
- Misses       1730     1734       +4     
  Partials      301      301              

see 2 files with indirect coverage changes

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