* webhook changes for observability
* go mod
* vendor
* Allow the webhook to accept a MetricsProvider. This makes it easier to unit test
Digging into OTel implementation it looks like instruments are cached.
Thus when different webhooks request the same instrument a cache lookup
for the instrument will occur.
* passthrough additional OTel interfaces
* linter fixes
* drop global meter in tests
* PR feedback
* PR feedback
* when recording the admission/conversion duration use the attributes from the labeler
* add a comment that otelhttp middleware creates the labeler
* simply code for readability
* change metric names to allow reuse across different webhook types
* fix linter
* tweak attribute names
Dave Protasowski