Project share user count limit

[ericokuma]

Resolves APP-524.

The project share popover previously capped user counts at 20 due to client-side pagination limits. This PR updates the ListUsergroupMemberUsers API to return a totalCount field, computed efficiently in SQL on the backend. Frontend components now directly use this totalCount for accurate display, eliminating the need for inefficient client-side counting.

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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