This fixes violations of the `vue/component-options-name-casing` and
`vue/component-name-in-template-casing` rules, enabled in
https://gitlab.com/gitlab-org/frontend/eslint-plugin/-/merge_requests/91.

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`.