Rename SkaffoldPipeline to SkaffoldConfig

[dgageot]

Fixes #2005

Signed-off-by: David Gageot david@gageot.net

[codecov-io]

Codecov Report

Merging #2015 into master will not change coverage.
The diff coverage is 96.72%.

@@           Coverage Diff           @@
##           master    #2015   +/-   ##
=======================================
  Coverage   55.49%   55.49%           
=======================================
  Files         173      173           
  Lines        7512     7512           
=======================================
  Hits         4169     4169           
  Misses       2952     2952           
  Partials      391      391

Impacted Files	Coverage Δ
pkg/skaffold/schema/versions.go	74.35% <ø> (ø)	⬆️
pkg/skaffold/initializer/init.go	21.6% <0%> (ø)	⬆️
pkg/skaffold/schema/v1beta7/config.go	100% <100%> (ø)	⬆️
pkg/skaffold/schema/v1beta1/config.go	100% <100%> (ø)	⬆️
pkg/skaffold/schema/v1beta5/upgrade.go	100% <100%> (ø)	⬆️
pkg/skaffold/schema/v1beta5/config.go	100% <100%> (ø)	⬆️
pkg/skaffold/schema/v1beta6/config.go	100% <100%> (ø)	⬆️
pkg/skaffold/schema/v1alpha3/config.go	100% <100%> (ø)	⬆️
pkg/skaffold/schema/v1alpha5/config.go	100% <100%> (ø)	⬆️
pkg/skaffold/schema/v1beta3/config.go	100% <100%> (ø)	⬆️
... and 16 more

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