Pull in depcheck, start queue-proxy blocklist

[mattmoor]

cc @dprotaso @tcnghia @vagababov

As we pick apart the binary and find others that shouldn't be here, let's expand.

[vagababov]

/lgtm

[codecov]

Codecov Report

Merging #9954 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9954      +/-   ##
==========================================
+ Coverage   87.78%   87.83%   +0.04%     
==========================================
  Files         183      183              
  Lines        8631     8631              
==========================================
+ Hits         7577     7581       +4     
+ Misses        802      800       -2     
+ Partials      252      250       -2     

Impacted Files	Coverage Δ
pkg/reconciler/autoscaling/kpa/scaler.go	90.00% <0.00%> (+1.42%)	⬆️
pkg/reconciler/revision/reconcile_resources.go	83.13% <0.00%> (+2.40%)	⬆️

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[tcnghia]

@mattmoor can we add a tracking issue and mention in your TODO to make clear what we try to achieve here? I think the context was mainly on Slack and may evade someones who only look at the code / failing tests when they create a seemingly harmless PR.

[mattmoor]

Yeah, I just opened #9957 let's part there.

[vagababov]

/lgtm

[tcnghia]

/lgtm

[knative-prow-robot]

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