some conformance tests assume we're getting back a runtime request

[dprotaso]

The changes in #963 broke some conformance tests.

Prior TestProbeHeaders would 'perform' a runtime request. This would have the image return the headers of the request etc.

Because the handlers were changes in the other PR this runtime info was not being returned causing the test to fail.

We can actually have the test inspect the response headers instead of the json payload.

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[dprotaso]

/hold verifying the change in knative-extensions/net-gateway-api#674

/assign @izabelacg

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.41%. Comparing base (75762ca) to head (aba9d2f).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #964      +/-   ##
==========================================
- Coverage   93.43%   93.41%   -0.02%     
==========================================
  Files          36       36              
  Lines        1249     1003     -246     
==========================================
- Hits         1167      937     -230     
+ Misses         69       53      -16     
  Partials       13       13              

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[dprotaso]

/hold cancel

downstream test passed

PASS test/conformance.TestIngressConformance/headers/probe/kingress_generates_hash (0.01s)
PASS test/conformance.TestIngressConformance/headers/probe/request_overrides_hash (0.01s)

[izabelacg]

/lgtm