Update downstream workflow

[dprotaso]

• add net-gateway-api
• drop net-certmanager

[skonto]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.14%. Comparing base (34f5e09) to head (a7a751f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1032   +/-   ##
=======================================
  Coverage   93.14%   93.14%           
=======================================
  Files          36       36           
  Lines        1254     1254           
=======================================
  Hits         1168     1168           
  Misses         72       72           
  Partials       14       14           

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