Label control does not support UIA accessiblility

[M-Lipin]

• .NET Core Version:
  .NET Core 5.0

Version: 5.0.100-alpha.1.20073.10
Commit: 29f4d693a9

Runtime Environment:
OS Name: Windows
OS Version: 10.0.18363
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\5.0.100-alpha1-05536\

Host (useful for support):
Version: 5.0.0-alpha.1.20072.3
Commit: c3dc1fdfdc

• Have you experienced this same bug with .NET Framework?:
  Yes

Problem description:

Accessibility providers:
"[pid:31748,providerId:0x11CFA Main:Nested [pid:31900,providerId:0x11CFA Annotation(parent link):Microsoft: Annotation Proxy (unmanaged:uiautomationcore.dll);
Main:Microsoft: MSAA Proxy (unmanaged:uiautomationcore.dll)];
Hwnd(parent link):Microsoft: HWND Proxy (unmanaged:uiautomationcore.dll)]"

Expected behavior:
There should be UIA accessibility provider from WinForms

Minimal repro:
Create WinForms app with Label control and analyze it using Inspect.

Related item:
This work item is the sub of #2164