Add prometheus annotations to net-kourier

[evankanderson]

Changes

Fixes #957

• 🎁 Adds prometheus scrape annotations for both controller and envoy pods.

Release Note

* Adds prometheus scraping annotations for net-kourier, so Prometheus Operator users should now be able to collect statistics automatically.

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: evankanderson

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[evankanderson]

/assign @nak3 @psschwei @skonto

cc @aryan9600

(you can /lgtm even if you're not in the org if you want)

[codecov]

Codecov Report

Merging #978 (f7e9e58) into main (47f6d83) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #978   +/-   ##
=======================================
  Coverage   80.60%   80.60%           
=======================================
  Files          18       18           
  Lines        1330     1330           
=======================================
  Hits         1072     1072           
  Misses        205      205           
  Partials       53       53           

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[nak3]

/lgtm