[release-1.4] Prober targets service instead of pods directly

[knative-prow-robot]

This is an automated cherry-pick of #2112

Receiver's prober targets services instead of pods directly to allow components to be part of an Istio mesh

[codecov]

Codecov Report

Merging #2158 (c0cbba0) into release-1.4 (9f516ca) will increase coverage by 5.41%.
The diff coverage is 95.23%.

@@                Coverage Diff                @@
##             release-1.4    #2158      +/-   ##
=================================================
+ Coverage          61.18%   66.60%   +5.41%     
- Complexity             0      677     +677     
=================================================
  Files                 70      142      +72     
  Lines               6841     9147    +2306     
  Branches               0      196     +196     
=================================================
+ Hits                4186     6092    +1906     
- Misses              2356     2650     +294     
- Partials             299      405     +106     

Flag	Coverage Δ
java-unittests	82.58% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
control-plane/pkg/prober/async_prober.go	88.88% <88.88%> (+0.13%)	⬆️
control-plane/pkg/prober/prober.go	67.74% <100.00%> (+4.77%)	⬆️
control-plane/pkg/reconciler/broker/controller.go	82.55% <100.00%> (+0.20%)	⬆️
control-plane/pkg/reconciler/channel/controller.go	89.02% <100.00%> (+0.13%)	⬆️
...ol-plane/pkg/reconciler/channel/v2/controllerv2.go	100.00% <100.00%> (ø)
control-plane/pkg/reconciler/sink/controller.go	77.94% <100.00%> (+0.32%)	⬆️
...lane/pkg/reconciler/consumergroup/consumergroup.go	76.52% <0.00%> (ø)
...ceiver/impl/handler/IngressRequestHandlerImpl.java	100.00% <0.00%> (ø)
...cher/impl/filter/subscriptionsapi/ExactFilter.java	100.00% <0.00%> (ø)
...atcher/impl/consumer/KafkaConsumerRecordUtils.java	100.00% <0.00%> (ø)
... and 70 more

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[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: knative-prow-robot, matzew

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[matzew]

/retest-required