Fix N+1 when looking up user's solo owned groups
What does this MR do?
Before this change, the solo_owned_groups lookup would generate additional queries for each group owned by the user, and is used in can_be_removed? user checks and profile view pages.
This preloads the owners for Groups to prevent the additional N+1 queries.
Related to #287618 (closed)
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After:
Does this MR meet the acceptance criteria?
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. -
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