[wasm] Update templates to work for multiple versions

[radical]

For supporting templates installed from two different wasm workloads, like wasm-experimental, and wasm-experimental-7, they need to be differentiated.

• Update identity to be unique with .8.0 suffix
• Add a framework parameter with default value of net8.0
  • this has been added for net7 templates also, and dotnet new will show both as options.

$ dotnet new wasmbrowser -h
...
  -f, --framework <net7.0|net8.0>  The target framework for the project.
                                   Type: choice
                                     net8.0  Target net8.0
                                     net7.0  Target net7.0
                                   Default: net8.0

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Issue Details

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For supporting templates installed from two different wasm workloads, like wasm-experimental, and wasm-experimental-7, they need to be differentiated.

• Update identity to be unique with .8.0 suffix
• Add a framework parameter with default value of net8.0
  • this will be added for net7 templates also, and dotnet new will show both as options.

$ dotnet new wasmbrowser -h
...
  -f, --framework <net7.0|net8.0>  The target framework for the project.
                                   Type: choice
                                     net8.0  Target net8.0
                                     net7.0  Target net7.0
                                   Default: net8.0

But until the packages from #76123 become available, and we switch to those:

$ dotnet new wasmbrowser -h
Template options:
  -f, --framework <net8.0>  The target framework for the project.
                            Type: choice
                              net8.0  Target net8.0
                            Default: net8.0

Author:	radical
Assignees:	-
Labels:	arch-wasm, area-Build-mono
Milestone:	-

[radical]

This needs packages from #76123 . Without that:

      [] --------------------------------------------------------------------------------------
      [] Unable to resolve the template, the following installed templates are conflicting:
      [] Identity             Template Name            Short Name   Language  Author     Package
      [] -------------------  -----------------------  -----------  --------  ---------  -------
      [] WebAssembly.Console  WebAssembly Console App  wasmconsole  C#        Microsoft         
      [] WebAssembly.Console  WebAssembly Console App  wasmconsole  C#        Microsoft         
      [] 
      [] Uninstall the template packages containing the templates to keep only one template from the list or add the template options which differentiate the template to run.