patch 8.2.1009: Vim9: some failures not checked for

Problem:    Vim9: some failures not checked for.
Solution:   Add test cases.  Remove unused code.
diff --git a/src/version.c b/src/version.c
index a3fedf1..c702791 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1009,
+/**/
     1008,
 /**/
     1007,