Summary

Updates rubocop gems and their configuration and fixes some offenses

Details

This pull requests does a couple of things:

• It tightens the rubocop dependency again, since there still are breaking changes in minor versions before 1.0, for example in changed cop names and configuration names
• It enables new cops by default, so updating rubocop doesn't entail manually enabling new cops. The tightened dependency makes sure this doesn't cause unexpected build failures
• It updates rubocop to the current latest version, 0.89.0
• It fixes some of the new offenses from new cops, and adds the others to the to-do list
• Finally, it updates rubocop-packaging

Motivation and Context

Keeps things up-to-date, and makes future updates of rubocop easier.

How Has This Been Tested?

Rubocop was run again after all changes were made.

Types of changes

• Refactoring (cleanup of codebase without changing any existing functionality)