Request to autoincrement number on directive label with Insert

Description

When a net label is created and ends with a number, hitting the 'Insert' hotkey creates a duplicate label with the ending number autoincremented, I would expect this same behaviour with a directive label. Very useful with component classes and multichannel repeat to create component class "Channel_1", "Channel_2", ... in the schematic.

Steps to reproduce

1. Create directive label with "String1" in the component class field and place on schematic page
2. Hit insert key
3. Duplicate directive label is made but number is not incremented

KiCad Version

Application: KiCad PCB Editor x64 on x64

Version: 9.0.7, release build

Libraries:
	wxWidgets 3.2.8
	FreeType 2.13.3
	HarfBuzz 12.2.0
	FontConfig 2.15.0

Platform: Windows 11 (build 26200), 64-bit edition, 64 bit, Little endian, wxMSW
OpenGL: Intel, Intel(R) UHD Graphics, 4.6.0 - Build 32.0.101.7077

	wxWidgets: 3.2.8 (wchar_t,wx containers)
	Boost: 1.89.0
	OCC: 7.9.2
	Curl: 8.17.0-DEV
	ngspice: 45.2
	Compiler: Visual C++ 1944 without C++ ABI
	KICAD_IPC_API=ON

Locale: 
	Lang: en_US
	Enc: UTF-8
	Num: 1,234.5
	Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)