[FE] Add ability to filter by provisioned users

Release notes

Problem to solve

This is the frontend counterpart to #350400 (closed)

Today within a project/group, you can have a mixture of provisioned and non-provisioned users, but there is no way to filter by this status.

We added an "Enterprise User" badge in #325712 (closed), It would be great if we could filter by badges (also SAML)

Implementation plan

Abstract app/assets/javascripts/members/components/filter_sort/members_filtered_search_bar.vue#L22 to an availableFilterTokens util in app/assets/javascripts/members/utils.js. Then create another availableFilterTokens util in ee/app/assets/javascripts/members/utils.js that extends the CE version and adds the Enterprise filter token.

Work icon to be used for drop down filter icon.

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