[`dotnet-new`] Add inRoot option for AddProjectsToSolutionPostAction

[levimatheri]

For dotnet-new issue #4178. Adds inRoot argument which is passed to dotnet sln add as --in-root.

cc @vlada-shubina

[dotnet-issue-labeler[bot]]

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[dnfadmin]

All CLA requirements met.

[vlada-shubina]

This change requires:

• documentation update: https://github.com/dotnet/templating/wiki/Post-Action-Registry
• JSON schema update: https://github.com/dotnet/templating/blob/main/src/Microsoft.TemplateEngine.Orchestrator.RunnableProjects/Schemas/JSON/template.json
• port to 7.0.2xx when branch is available

[levimatheri]

@vlada-shubina I'm not sure about the unit test, I don't see one for --solution-folder? Sorry, a bit new to this. Do we just need to test if DotnetSlnPostActionProcessor.TryGetProjectFilesToAdd returns true if --in-root is passed in?

[levimatheri]

@vlada-shubina Also, was going to add another LocalizableString for the --in-root option output. How are these translated? https://github.com/dotnet/sdk/blob/3eea35e0d77f9a1bc418a364805ff89df818e371/src/Cli/dotnet/commands/dotnet-new/LocalizableStrings.resx#L161-L166

[vlada-shubina]

@vlada-shubina I'm not sure about the unit test, I don't see one for --solution-folder? Sorry, a bit new to this. Do we just need to test if DotnetSlnPostActionProcessor.TryGetProjectFilesToAdd returns true if --in-root is passed in?

Testing TryGetProjectFilesToAdd doesn't make a lot of sense.

I would do a test similar to https://github.com/dotnet/sdk/blob/39f66f56bd9d66ccfdb904482d283b5506fc5a68/src/Tests/dotnet.Tests/dotnet-new/DotnetSlnPostActionTests.cs#L197-L223 and check if --inRoot from args was passed properly to the mock callback.

[vlada-shubina]

@vlada-shubina Also, was going to add another LocalizableString for the --in-root option output. How are these translated?

https://github.com/dotnet/sdk/blob/3eea35e0d77f9a1bc418a364805ff89df818e371/src/Cli/dotnet/commands/dotnet-new/LocalizableStrings.resx#L161-L166

Just change an English string in LocalizableStrings.resx as needed and build. The translation will come automatically after some time. If you are using placeholder or some text should not be translated, consider explaining them in Comments column.

[levimatheri]

@vlada-shubina PR got messed up, will submit another one.