added support for interface type in schema check

[balopat]

PR [ 1 / 3] breaking down #2917.
Related to #2775.

Description

Adds support for interface{} type signature to schema changes checker. It would panic otherwise on v1beta5 for example.

User facing changes

n/a

Next PRs.

• (6 files) the new comment management logic and hooking it up to release and new_config
• (20 files) update of the comments historically on all config.go files

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes unit tests
• Mentions any output changes.
• Adds documentation as needed: user docs, YAML reference, CLI reference.
• Adds integration tests if needed.

Reviewer Notes

• The code flow looks good.
• Unit test added.
• User facing changes look good.

[codecov]

Codecov Report

Merging #2924 into master will not change coverage.
The diff coverage is n/a.

Impacted Files	Coverage Δ
pkg/skaffold/server/server.go	58.57% <0%> (ø)	⬆️