Ran standardrb --fix on the whole codebase

What does this MR do?

Ran standardrb --fix on the whole codebase

Inspired by https://twitter.com/searls/status/1101137953743613952 I decided to try https://github.com/testdouble/standard on our codebase.

It's opinionated, but at least it's a standard.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer