fix(schemas): make illustration nullable in GitLabPipelineSchema

schemas.ts

@@ -40,7 +40,7 @@ export const GitLabPipelineSchema = z.object({
       image: z.string().optional(),
       size: z.string().optional(),
       title: z.string().optional(),
-    }).optional(),
+    }).nullable().optional(),
     favicon: z.string().optional(),
   }).optional(),
 });
@@ -549,13 +549,13 @@ export const GitLabDiscussionNoteSchema = z.object({
         .object({
           start: z.object({
             line_code: z.string(),
-            type: z.enum(["new", "old", "expanded"]).optional(),
+            type: z.enum(["new", "old", "expanded"]),
             old_line: z.number().nullable(),
             new_line: z.number().nullable(),
           }),
           end: z.object({
             line_code: z.string(),
-            type: z.enum(["new", "old", "expanded"]).optional(),
+            type: z.enum(["new", "old", "expanded"]),
             old_line: z.number().nullable(),
             new_line: z.number().nullable(),
           }),