Add a canary pod label

[ahmed-mez]

What does this PR do?

Add the label extendeddaemonsetreplicaset.datadoghq.com/canary=true as canary pods label

Motivation

Ease monitoring canary pods

Describe your test plan

• Start a canary deploy
• Canary pods must have the extendeddaemonsetreplicaset.datadoghq.com/canary=true label (k get po -l extendeddaemonsetreplicaset.datadoghq.com/canary=true)
• Validate the canary k eds canary validate <eds-name>
• k get po -l extendeddaemonsetreplicaset.datadoghq.com/canary=true must return No resources found

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@d72a1bc). Click here to learn what that means. The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master      #52   +/-   ##
=========================================
  Coverage          ?   36.73%           
=========================================
  Files             ?       29           
  Lines             ?     1530           
  Branches          ?        0           
=========================================
  Hits              ?      562           
  Misses            ?      895           
  Partials          ?       73           

Flag	Coverage Δ
#unittests	36.73% <0.00%> (?)

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Impacted Files	Coverage Δ
...ers/extendeddaemonsetreplicaset/strategy/canary.go	0.00% <0.00%> (ø)
...endeddaemonsetreplicaset/strategy/rollingupdate.go	9.00% <0.00%> (ø)
...lers/extendeddaemonsetreplicaset/strategy/utils.go	19.23% <0.00%> (ø)

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