Fix incorrect tooltip when local methods override global functions

[EdwardChanCH]

Closes: #106840

Related: #106984

Note: This is split from #106987, since the original PR became too bloated.

[EdwardChanCH]

Below is a full summary of what this PR fixed, and what will be fixed in future issues/proposals:
godotengine/godot-proposals#14425, #117305

class_name _Main
extends Node

# Shows NATIVE_METHOD_OVERRIDE warning.
func get(_property: StringName) -> Variant:
	# Shows tooltip Object.get() on hover center.
	# Shows tooltip Object.get() on hover first letter.
	return 100

# Missing warning. --> Proposal #14425
func char(code :int):
	# Shows tooltip @GDScript.char() on hover center.
	# Shows tooltip @GDScript.char() on hover first letter.
	return 200

# Missing warning. --> Proposal #14425
func log(x: float):
	# No tooltip on hover center.       <-- Fixed! Now shows @GlobalScope.log().
	# No tooltip on hover first letter. <-- Fixed! Now shows @GlobalScope.log().
	return 300

func unique(n: float):
	# No tooltip on hover center.
	# No tooltip on hover first letter.
	return 400

# Note: Named lambdas do not actually override anything.

var named_lambda_1 = func get():
	# No tooltip on hover center.
	# Shows tooltip _Main.get() on hover first letter. --> Issue #117305
	return null

var named_lambda_2 = func char():
	# Shows tooltip @GDScript.char() on hover center. <-- Fixed! Now no tooltip.
	# Shows tooltip @GDScript.char() on hover first letter. --> Issue #117305
	return null

var named_lambda_3 = func log():
	# No tooltip on hover center.
	# Shows tooltip _Main.log() on hover first letter. <-- Fixed! Now shows @GDScript.char(). --> Issue #117305
	return null

var named_lambda_4 = func unique():
	# No tooltip on hover center.
	# Shows tooltip _Main.unique() on hover first letter. --> Issue #117305
	return null

func _ready() -> void:
	# Shows tooltip _Main.log() on hover center.       <-- Fixed! Now shows @GlobalScope.log().
	# Shows tooltip _Main.log() on hover first letter. <-- Fixed! Now shows @GlobalScope.log().
	print(log(10)) # Prints 2.30258509299405
	
	var main = _Main.new()
	# Shows tooltip _Main.log() on hover center.
	# Shows tooltip _Main.log() on hover first letter.
	print(main.log(10)) # Prints 300