Remove podSelector from Runner

[nkubala]

Now that all podSelector-dependent components have been moved inside the Deployer, the podSelector serves no purpose inside the Runner.

[codecov]

Codecov Report

Merging #6076 (74b8493) into master (f08c6d6) will increase coverage by 0.01%.
The diff coverage is 62.50%.

@@            Coverage Diff             @@
##           master    #6076      +/-   ##
==========================================
+ Coverage   70.19%   70.21%   +0.01%     
==========================================
  Files         475      475              
  Lines       18147    18142       -5     
==========================================
  Hits        12739    12739              
+ Misses       4471     4469       -2     
+ Partials      937      934       -3     

Impacted Files	Coverage Δ
pkg/skaffold/deploy/kpt/kpt.go	80.85% <ø> (-0.07%)	⬇️
pkg/skaffold/runner/v1/runner.go	0.00% <ø> (ø)
pkg/skaffold/deploy/kubectl/kubectl.go	68.31% <50.00%> (ø)
pkg/skaffold/deploy/kustomize/kustomize.go	74.34% <50.00%> (ø)
pkg/skaffold/runner/deployer.go	59.03% <56.25%> (-2.33%)	⬇️
pkg/skaffold/deploy/helm/deploy.go	78.22% <100.00%> (ø)
pkg/skaffold/runner/v1/new.go	64.16% <100.00%> (-0.59%)	⬇️
pkg/skaffold/docker/parse.go	86.19% <0.00%> (-0.96%)	⬇️
pkg/skaffold/event/v2/status_check.go	100.00% <0.00%> (ø)
pkg/skaffold/docker/image.go	79.53% <0.00%> (+1.39%)	⬆️
... and 1 more

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