16212: Refactors PeopleSelect component used on 'Share' dialog.

16212: Refactors PeopleSelect component used on 'Share' dialog.

* Now named ParticipantSelect as it also retrieves Groups.
* Search for 'any' field on Users instead of just email.
* Don't request groups if 'onlyPeople' prop passed.
* Show users' display name, including email.
* Fix chip rendering to show the same as what's listed.

TBD: ParticipantSelect retrieves only 5 items per request when autocompleting.
This may not be what users expect, but listing too many items require UI
adjustments.

Arvados-DCO-1.1-Signed-off-by: Lucas Di Pentima <lucas@di-pentima.com.ar>