LSIF uploads fail with abbreviated OID

Created by: efritz

Uploading LSIF data with an abbreviated OID produces an error from src lsif upload:

failed to enqueue payload: pq: new row for relation "lsif_uploads" violates check constraint "lsif_uploads_commit_valid_chars"

This is the wrong error to display - we should be validating the hash before attempting to insert it. Best implementation would be able to disambiguate an abbreviated OID into a full one, as we need to ensure that the commit exists first anyway.