Remove (2) from folder names in sdk.slnx

[jjonescz]

These (2)s in folder names don't seem necessary. cc @kasperk81

[Copilot]

Pull Request Overview

This PR removes unnecessary (2) suffixes from folder names in the sdk.slnx solution file.

• Cleans up folder naming by stripping out (2)
• Applies consistent naming across BlazorWasmSdk, RazorSdk, and WebSdk sections

[kasperk81]

ran dotnet sln migrate command on sdk.sln without any manual edit. is it something which should be fixed in the command? if not, why does it matter for this sln and not the 480 sln files converted in runtime dotnet/runtime#115818?

[baronfel]

The (2) were there in the original sln as well:

sdk/sdk.sln

Lines 155 to 159 in 8ffe243

	Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Sdk (2)", "Sdk (2)", "{F717D467-EF88-49B9-AD67-55FC6350A9DE}"
	ProjectSection(SolutionItems) = preProject
	src\WebSdk\Publish\Sdk\Sdk.props = src\WebSdk\Publish\Sdk\Sdk.props
	src\WebSdk\Publish\Sdk\Sdk.targets = src\WebSdk\Publish\Sdk\Sdk.targets
	EndProjectSection

Just a quirk of the sln here, not indicative of a larger issue.