server: fix a leak in schema construction for role
introspection data from 'result' is retained unnecessarily for
non-admin roles where we just need the validation effect.
live_bytes -6% for huge_schemaa
Also force remoteSchemaErrors, though I don't know if this has any
performance effect
GitOrigin-RevId: ac41019b309043065b176f99606c316523f53f00