[wip] Webhook OTel changes

[dprotaso]

This stacks onto the shared main PR - https://github.com/knative/pkg/pull/3190

You can review the webhook changes here

• webhook changes for observability
• go mod
• vendor

[dprotaso]

/assign @Cali0707 @evankanderson @skonto

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.69565% with 13 lines in your changes missing coverage. Please review.

Project coverage is 76.00%. Comparing base (7a5377f) to head (624cd94). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
webhook/conversion.go	68.57%	8 Missing and 3 partials :warning:
webhook/metrics.go	91.66%	1 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3189      +/-   ##
==========================================
- Coverage   76.05%   76.00%   -0.05%     
==========================================
  Files         205      205              
  Lines       11751    11710      -41     
==========================================
- Hits         8937     8900      -37     
+ Misses       2541     2540       -1     
+ Partials      273      270       -3     

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[dprotaso]

This is ready for a review cc @evankanderson @Cali0707

Based on the feedback from the OTel folks I removed the package variable instruments. This makes unit tests easier to write and FYI the instruments are de-duped by the otel-go sdk when multiple webhooks are created (excluding the pointers in our webhook struct)

[dprotaso]

rebased

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, dprotaso, evankanderson

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• ~~OWNERS~~ [Cali0707,dprotaso]

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[dprotaso]

/hold cancel

@evankanderson if you have any follow up comments let me know and i can do them in a follow up PR next week.