Geo Frontend - Support search filter on "selective sync by organization" dropdown

Problem

Geo supports selective synchronization by namespace. We should add the ability for a .com sysadmin to specify a set of organizations to replicate to a secondary site.

Proposal

This follows Geo Frontend - Add "selective sync by organizat... (#570585 - closed)

1. On the Edit Geo site page in the Geo admin page, update the Organizations to synchronize dropdown to support search filters.

#514251 (comment 2326359182)

Yep this looks solid to cover configuring a site for this form of selective sync @dbalexandre. Some places we will need code changes:

• Add new supported type to the geo_helper.rb#selective_sync_types_json
• Add a new Vue file for geo-site-form-organizations this will likely be similar to the file for Groups geo_site_form_namespaces.vue
  • Depending on the overlap there may be an opportunity to generalize geo_site_form_namespaces.vue to be data-driven and handle namespace or organization lookups based on the selected dropdown item.
• Expose the new type in the parent vue component geo_site_form_selective_sync.vue

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Additionally, we will want to ensure the selective sync organizations is represented on the Geo Admin Dashboard. I believe the code is built to handle any new sync types based on the code geo_site_sync_settings.vue but we will want to verify when it is implemented.