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test(e2e): migrate AddGroupUsers callers to SetGroupMemberRole

CI failed on the AddGroupUsers removal because the e2e regression tests
still called the now-deleted RPC. Migrates the 5 call sites to
SetGroupMemberRole with the app_group_member role, resolved once in
SetupSuite alongside the existing org-role lookups.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>