fix: broken user group table infinite query

[AdityaHegde]

User group table queried a new page each time replacing the old one. Updated to use infinite queries so that all pages are retained.

Closes APP-923

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!

[Copilot]

Pull request overview

This PR fixes pagination behavior in the organization User Groups page by switching the underlying data fetch from a single-page query (that replaced results) to an infinite query that retains all previously loaded pages.

Changes:

• Update the user groups route to consume an infinite query and aggregate pages[] into one list for filtering/rendering.
• Add a getOrgUsergroupsInfinite selector to centralize the infinite-query configuration and next-page token handling.
• Update Orval-generated client/query helpers and Orval config to support an infinite query variant for listing org member usergroups.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
web-admin/src/routes/[organization]/-/users/groups/+page.svelte	Switch groups page to infinite query, flatten paged results, and trigger fetchNextPage() on load-more.
web-admin/src/features/organizations/user-management/selectors.ts	Add getOrgUsergroupsInfinite selector wrapping the new Orval infinite query helper.
web-admin/src/client/gen/default/default.ts	Generated: add infinite-query key/options + createAdminServiceListOrganizationMemberUsergroupsInfinite.
web-admin/orval.config.ts	Enable useInfinite generation for AdminService_ListOrganizationMemberUsergroups.

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