Convert VButton, tabs and item group components to script setup

[obulat]

Fixes

Related to #4678 by @obulat

Description

This PR converts components such as VButton, VItemGroup (including search types popover), tabs, and brand in the header/footer to script setup.

The following conversions are done:

• remove defineComponent and returns
• convert props to defineProps with withDefaults if necessary
• script setup does not set options.name anymore, so useComponentName doesn't return anything. We could either add useOptions({ name: componentName }) to the components that need the name in the analytics, or send the component name when initializing the useSearchType. I decided to do the latter, to explicitly pass the component name, instead of adding options.name to only a handful of components that need it and making the codebase inconsistent, or adding an unnecessary options to all components.

It also adds a ZIndex type to replace the Vue runtime validators.
LoadingIcon wasn't used, so it was removed.

Testing Instructions

The CI should pass.
Also, the components affected should work correctly:

• Search types popover
• Pages menu popover
• Openverse logo links in the header and the footer
• Tabs for the attribution
• Content settings modal tabs
• Button should work both when it's a button (as in the header content switcher, filter button) and a link (e.g., the Openverse logo link in the header)

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

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[zackkrida]

Nice work! LGTM.