### Godot version

v4.1.stable.official [970459615]

### System information

Godot v4.1.stable - Pop!_OS 22.04 LTS - Vulkan (Compatibility) - NVIDIA GeForce MX350 (nvidia; 525.116.04) - 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz (8 Threads)

### Issue description

When I use the color picker to change a color, I can paste an HTML color code or write it myself. I can also prefix my text with a `#`  &mdash; the color picker will accept it as a valid color and update the corresponding element with that color. This is especially useful when I copy an HTML color code from a color palette like the one on lospec.com, since they always have a hash in front of them.

However, I cannot paste HTML color codes with surrounding spaces into this text box, even though the color code (without the spaces) is valid.

I would definitely call this behaviour a bug, since other programs like Affinity Designer, Blender or Gimp are very permissive about the input of HTML color codes. Or according to Jon Postel, *Be conservative in what you send, be liberal in what you accept.*

### Steps to reproduce

Preparation: 

1. create a new Godot project
2. create a new 2d scene
3. add a ColorRect node.
4. open the color picker for the color attribute in the inspector tab.

Explore the bug:

1. enter a valid HTML color code like `000` (black) => color is updated.
2. enter a valid HTML color code like `#fff` (white) => color is updated.
3. enter a valid HTML color code with leading space, for example `   #000` => color is not updated.
4. enter a valid HTML color code like `#000`(black) => color is updated.
5. enter a valid HTML color code with surrounding spaces, e.g. `   fff   ` => color is not updated.
6. enter a valid HTML color code like `fff`=> color is updated.

### Minimal reproduction project

N/A
if (!is_inside_tree()) {
		return;
	}
	if (!picker_window) {
		picker_window = memnew(Popup);
		picker_window->hide();
		picker_window->set_transient(true);
		add_child(picker_window);
		picker_texture_rect = memnew(TextureRect);
		picker_texture_rect->set_anchors_preset(Control::PRESET_FULL_RECT);
		picker_window->add_child(picker_texture_rect);
		picker_texture_rect->set_default_cursor_shape(CURSOR_POINTING_HAND);
		picker_texture_rect->connect("gui_input", callable_mp(this, &ColorPicker::_picker_texture_input));
		picker_preview = memnew(Panel);
		picker_preview->set_anchors_preset(Control::PRESET_CENTER_TOP);
		picker_preview->set_mouse_filter(MOUSE_FILTER_IGNORE);
		picker_window->add_child(picker_preview);
		picker_preview_label = memnew(Label);
		picker_preview->set_anchors_preset(Control::PRESET_CENTER_TOP);
		picker_preview_label->set_text("Color Picking active");
		picker_preview->add_child(picker_preview_label);
		picker_preview_style_box = (Ref<StyleBoxFlat>)memnew(StyleBoxFlat);
		picker_preview_style_box->set_bg_color(Color(1.0, 1.0, 1.0));