sql: check for resultWriter error in runPlanInsidePlan

In #104553, we modified
`runPlanInsidePlan` to plan and run checks after planning and running
the inside plan. Although we check for comm errors after the initial
call to `PlanAndRun` to see if we should exit early, we neglected to
also check the result writer for errors. Since not all result writer
errors may be copied into the comm errors, we fix that here.

Epic: None
Informs: #87289

Release note: None

pkg/sql/apply_join.go

@@ -347,6 +347,9 @@ func runPlanInsidePlan(
 	if recv.commErr != nil {
 		return recv.commErr
 	}
+	if resultWriter.Err() != nil {
+		return resultWriter.Err()
+	}
 
 	evalCtxFactory2 := func(usedConcurrently bool) *extendedEvalContext {
 		return evalCtxFactory()