GDScript: Add annotation to ignore warnings

modules/gdscript/tests/scripts/analyzer/features/warning_ignore_annotation.gd

@@ -0,0 +1,15 @@
+@warning_ignore(unused_private_class_variable)
+var _unused = 2
+
+@warning_ignore(unused_variable)
+func test():
+	print("test")
+	var unused = 3
+
+	@warning_ignore(redundant_await)
+	print(await regular_func())
+
+	print("done")
+
+func regular_func():
+	return 0

modules/gdscript/tests/scripts/analyzer/features/warning_ignore_annotation.out

@@ -0,0 +1,4 @@
+GDTEST_OK
+test
+0
+done