GlTokenSelector: add `data-qa-selector` props

Follow-up to gitlab!36240 (comment 378455487)

In QA E2E tests we are currently interacting with the component via CSS classes. This is less than ideal because the tests will break if the CSS classes change. We can add props to be able to interact with this component via data-qa-selector.

Component	Prop	Element to apply data-qa-selector attribute to
GlTokenSelector	data-qa-text-input-selector	<input type="text" ... />
GlTokenSelector	data-qa-close-token-selector	<gl-token />
GlToken	data-qa-close-token-selector	<gl-icon />

Update https://gitlab.com/gitlab-org/gitlab/-/blob/e044f3946a8773cdeeb4bc8b283ef12b906bfc52/qa/qa/ee/page/group/settings/general.rb#L69 once this is completed