[kubernetes_state] fix missing columns in metadata.csv

[chotiwat]

What does this PR do?

This pr fixes some rows with a missing column in metadata.csv.

Motivation

I was looking at the file to see the available metrics and saw GitHub warning about the mismatch in the number of columns.

Testing Guidelines

An overview on testing
is available in our contribution guidelines.

Versioning

• Bumped the check version in manifest.json
• Bumped the check version in datadog_checks/{integration}/__init__.py
• Updated CHANGELOG.md. Please use Unreleased as the date in the title
  for the new section.
• If PR impacts documentation, docs team has been notified or an issue has been opened on the documentation repo

Additional Notes

GitHub editor automatically added a newline at the end of file. I hope that doesn't break the parser.

[chotiwat]

I'm not sure if I should bump the version or not since 2.3.0 is unreleased.

[masci]

No need to bump, good to go!