[frontend] Set log level to INFO for UserError thrown in gRPC Frontend WFE
Description
This ensures the behavior is identical to the XRootD/SSI frontend and fixes some errors being logged in the tests due to this discrepancy that was previously there.
Checklist
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Documentation reflects the changes made. -
Merge Request title is clear, concise, and suitable as a changelog entry. See this link
References
Closes #1162 (closed)
Edited by Konstantina Skovola