* Revert "Improve missing default signer error messaging (#17486)" This reverts commit6d40d0d141
. (cherry picked from commitca8c1c6c42
) * Improve missing default filepath signer error messaging (cherry picked from commit06a926f2f4
) * CI: temporarily skip spl downstream build (cherry picked from commitd01b4f80f9
) Co-authored-by: Trent Nelson <trent@solana.com>