feat: erased accidentally added engine files

engine/modules/gdscript/tests/scripts/parser/warnings/standalone_expression.gd

@@ -1,21 +0,0 @@
-func test():
-	# The following statements should all be reported as standalone expressions:
-	1234
-	0.0 + 0.0
-	Color(1, 1, 1)
-	Vector3.ZERO
-	[true, false]
-	float(125)
-	# The following statements should not produce `STANDALONE_EXPRESSION`:
-	var _a = 1
-	_a = 2 # Assignment is a local (or global) side effect.
-	@warning_ignore("redundant_await")
-	await 3 # The `await` operand is usually a coroutine or a signal.
-	absi(4) # A call (in general) can have side effects.
-	@warning_ignore("return_value_discarded")
-	preload("../../utils.notest.gd") # A static initializer may have side effects.
-	"""
-	Python-like "comment".
-	"""
-	@warning_ignore("standalone_ternary")
-	1 if 2 else 3 # Produces `STANDALONE_TERNARY` instead.