Watch all artifact workspaces, including those outside of the working directory

[priyawadhwa]

This should fix #2613: Watcher doesn't detect changes when artifacts are outside the directory from where skaffold is run

[nkubala]

LGTM, can you fix the lint issue?

[codecov]

Codecov Report

Merging #2614 into master will decrease coverage by 0.49%.
The diff coverage is 72.72%.

Impacted Files	Coverage Δ
pkg/skaffold/trigger/triggers.go	33.69% <72.72%> (+2.74%)	⬆️
pkg/skaffold/deploy/status_check.go	63.23% <0%> (-4.46%)	⬇️
pkg/skaffold/runner/new.go	70.07% <0%> (ø)	⬆️
pkg/skaffold/schema/defaults/defaults.go	90.41% <0%> (ø)	⬆️
cmd/skaffold/app/cmd/flags.go	100% <0%> (ø)	⬆️
pkg/skaffold/schema/versions.go	74.35% <0%> (ø)	⬆️
pkg/skaffold/runner/runner.go	0% <0%> (ø)	⬆️
pkg/skaffold/pipeline/pipeline_resource.go	68.42% <0%> (ø)
pkg/skaffold/pipeline/pipeline.go	100% <0%> (ø)
pkg/skaffold/generate_pipeline/profile.go	21.12% <0%> (ø)
... and 6 more

[priyawadhwa]

thanks @nkubala , done