Use InvalidArgument error for invalid page token
Contributes to gitlab#419418
Problem
When user provides an invalid page token, Gitaly returns an Internal error. That makes more difficult to Gitaly client to handle this error.
Solution
FindAllTags
already returns an InvalidArgument
error when page token is invalid.
Separate invalid page token error from other errors and return
InvalidArgument error type for FindAllBranches
too.
Edited by Vasilii Iakliushin