Replace 'GoogleContainerTools' references with 'kptdev' in kpt repo

[liamfallon]

This PR replaces references to GoogleContainerTools with kptdev.Apologies for the size of this PR but this has to be done in one big PR.

• The code builds locally and the linting works
• GoogleContainerTools has a kpt-config-sync repo, references to this repo were not removed for now until we decide what to do with it, ti may be a kpt clone of the regular configsync
• golang and linter versions are updated due to out of date versions throwing errors
• the sub-module "rollouts" is disable because the kpt main module refers to packages in it and it refers to "kptdev" packages in the kpt main module that are not in Github until this PR is merged (circular module dependency). Once this PR is merged, the "rollout" module can be re-enabled and merged
• Some small lint errors showing up in the code due to the bump in the linter version have been fixed
• The Porch API is now imported from the Nephio porch
• Downgrade image: "k8s.gcr.io/pause:2.0" to "image: k8s.gcr.io/pause:1.0" in live end to end test data to avoid Docker metadata type error.
• Dependencies updated in go.mod

[kispaljr]

I obviously haven't read through all the changes one-by-one, but based on the few key files I checked and your comments looks good to me.