Similar to #34544, this PR changes the `opts` argument in
`SearchRepositoryByName()` to be passed by value instead of by pointer,
as its mutations do not escape the function scope and are not used
elsewhere. This simplifies reasoning about the function and avoids
unnecessary pointer usage.
This insight emerged during an initial attempt to refactor
`RenderUserSearch()`, which currently intermixes multiple concerns.
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Co-authored-by: Philip Peterson <philip-peterson@users.noreply.github.com>
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