Relationship Field Search: Implement endpoint

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Parent Issue

#31127

User Story

As a Content Author, I want to filter by a query, site, folder, or language field to refine the relationships so that I can select the appropriate content to relate to an item.

Acceptance Criteria

1. Create a content type with a relationship.
2. Create content based on the previously created content.
3. Open the filter popover.
4. Select the fields to filter by query, language, or site.
5. The content in the table should display results according to the selected filters.

Proposed Objective

Core Features

Proposed Priority

Priority 3 - Average

External Links... Slack Conversations, Support Tickets, Figma Designs, etc.

No response

Assumptions & Initiation Needs

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Quality Assurance Notes & Workarounds

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Sub-Tasks & Estimates

No response