### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

if (r_constant_value) {
			if (shader->constants[p_identifier].initializer && shader->constants[p_identifier].initializer->values.size() == 1) {
				*r_constant_value = shader->constants[p_identifier].initializer->values[0];
			}
		}
		if (r_type) {
			*r_type = IDENTIFIER_CONSTANT;
		}
		return true;
	}
	for (int i = 0; i < shader->functions.size(); i++) {
		if (!shader->functions[i].callable) {
			continue;
		}
		if (shader->functions[i].name == p_identifier) {
			if (r_data_type) {
				*r_data_type = shader->functions[i].function->return_type;
			}
			if (r_array_size) {
				*r_array_size = shader->functions[i].function->return_array_size;
			}
			if (r_type) {
				*r_type = IDENTIFIER_FUNCTION;
			}
			return true;
		}
	}
	return false;
}
bool ShaderLanguage::_validate_operator(OperatorNode *p_op, DataType *r_ret_type, int *r_ret_size) {