add contour-gateway.yaml to third_party folder

[izabelacg]

Changes

• Add contour-gateway.yaml to third_party/gateway-api-latest folder

PS: this PR is just to speed things up, the contour-gateway.yaml file will be added automatically as part of the following nightly job (starting tomorrow): knative-extensions/knobots#372

Part of #14983

[izabelacg]

/assign @dprotaso

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.06%. Comparing base (88abc84) to head (51ffff1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14998      +/-   ##
==========================================
- Coverage   84.08%   84.06%   -0.02%     
==========================================
  Files         213      213              
  Lines       16687    16687              
==========================================
- Hits        14031    14028       -3     
- Misses       2303     2306       +3     
  Partials      353      353              

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[dprotaso]

The test scripts assume only gateway+istio so it tries to apply everything in the folder

 kapp: Error: Uniqueness errors:
- Found resource 'configmap/config-gateway (v1) namespace: 3fc12db6-02b2-4ab0-a1b8-a46d5dba5b55' multiple times with different content
exit status 1 

serving/test/e2e-common.sh

Lines 285 to 287 in 455d3e5

	# This installs an istio version that works with the v1alpha1 gateway api
	YTT_FILES+=("${E2E_YAML_DIR}/gateway-api/install")
	YTT_FILES+=("${REPO_ROOT_DIR}/third_party/${ingress}-latest")

[izabelacg]

Hmm... it means then once the nightly job runs and adds contour-gateway.yaml, the tests are gonna fail for others PRs too, right? Let me know if the workaround I just pushed would be ok for now. Then I can open another PR with that workaround just to make sure things don't break after the nightly runs. And I can keep working on a definite solution to switch/select between contour / istio + gateway api

[izabelacg]

/retest

[dprotaso]

/lgtm
/approve

yeah this is fine for now

[knative-prow]

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