Project share popover user count

[ericokuma]

Fixes APP-524: The project share popover displayed a maximum of 20 users due to counting only paginated results.

This PR introduces and utilizes a total_count field in the ListUsergroupMemberUsersResponse API. The backend now performs a direct count query, and the frontend consumes this total_count to accurately display the full number of organization members.

Includes a fix for a related bug where the user list query was unintentionally disabled in the dropdown.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

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Linear Issue: APP-524

 

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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