Fix inconsistent tooltip for @GlobalScope constants

[EdwardChanCH]

Closes: #106944

Related: #117308

Note: This is split from #106984, since the original PR became too bloated.

[EdwardChanCH]

Below is a full summary of what this PR fixed:
(i.e. only the tooltip for the shadowed PI has changed)

class_name _Main
extends Node

var PI = -10 # Shows tooltip @GDScript.PI. <-- Fixed! Now no tooltip.
var OK = -20 # No tooltip.

enum Error { # No tooltip.
	OK = -30 # No tooltip.
}
var Side = -40 # No tooltip.
var MouseButtonMask = -50 # No tooltip.

var number = -60 # No tooltip.

func _ready() -> void:
	var _a = PI # Shows tooltip @GDScript.PI. <-- Fixed! Now shows _Main.PI.
	var _b = TAU # Shows tooltip @GDScript.TAU.
	var _c = OK # Shows tooltip _Main.OK.
	var _d = FAILED # Shows tooltip @GlobalScope.FAILED.
	var _e = Error # Shows tooltip _Main.Error.
	var _f = Error.OK # Shows tooltips _Main.Error and _Main.OK.
	#var _g = Error.FAILED # Shows tooltip _Main.Error.
	var _h = Side # Shows tooltip _Main.Side.
	#var _i = ClockDirection # Shows tooltip @GlobalScope.ClockDirection.
	var _j = MouseButtonMask # Shows tooltips _Main.MouseButtonMask.
	#var _k = JoyButton # Shows tooltips @GlobalScope.@JoyButton.
	var _z = number # Shows _Main.number.
	
	print(_a) # Prints -10
	print(_b) # Prints 6.28318530717959
	print(_c) # Prints -20
	print(_d) # Prints 1
	print(_e) # Prints { "OK": -30 }
	print(_f) # Prints -30
	print(_h) # Prints -40
	print(_j) # Prints -50
	print(_z) # Prints -60