GDScript: Fix @warning_ignore annotation issues

modules/gdscript/tests/scripts/parser/features/class_inheritance_access.gd

@@ -4,6 +4,7 @@ class Parent:
 
 	var parent_variable := 2
 
+	@warning_ignore("unused_signal")
 	signal parent_signal
 
 	var parent_attribute: int:

modules/gdscript/tests/scripts/parser/features/lambda_ends_with_new_line.gd

@@ -14,6 +14,7 @@ func test():
     print(v)
     print()
 
+    @warning_ignore("standalone_ternary")
     v=func(): print(2) if false else print(3)
     @warning_ignore("unsafe_cast")
     (v as Callable).call()

modules/gdscript/tests/scripts/parser/features/match.gd

@@ -14,3 +14,6 @@ func test():
 			print("This won't match")
 		_:
 			print("This will match")
+
+	match 0:
+		pass

modules/gdscript/tests/scripts/parser/features/signal_declaration.gd

@@ -1,5 +1,3 @@
-#GDTEST_OK
-
 # No parentheses.
 signal a
 
@@ -16,5 +14,15 @@ signal d(
 	c,
 )
 
+# With type hints.
+signal e(a: int, b: Variant, c: Node)
+
+func no_exec():
+	a.emit()
+	b.emit()
+	c.emit()
+	d.emit()
+	e.emit()
+
 func test():
 	print("Ok")