Use consistent casing for component names

What does this MR do and why?

Use consistent casing for component names

This fixes violations of the vue/component-options-name-casing and vue/component-name-in-template-casing rules, enabled in gitlab-org/frontend/eslint-plugin!91 (merged).

This has for a long time been our convention, but until now hasn't been automatically enforced.

Most of this was done using yarn lint:eslint:all:fix, with gitlab-org/frontend/eslint-plugin!91 (merged) applied locally.

Screenshots or screen recordings

n/a

How to set up and validate locally

Does the pipeline pass?

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.