MSTest docs as a submodule

[Evangelink]

Describe the issue or suggestion

@gewarren Do you know if that would be somehow possible to have some/most of MSTest docs available in MSTest repo and "cloned"/"submoduled" or whatever solution here so we could make it simpler for us (and copilot) to improve/add documentation as we are adding the new feature?

In the current form, we have to think about all docs to update as we move closer to the release and often time we miss things.

cc @Youssef1313

[gewarren]

@Evangelink Yes, it's possible. For the C# language proposals, the source is in the dotnet/csharplang repo, and they are published on Learn through this dotnet/docs repo using configuration settings like the following:

Add the source repo:

docs/.openpublishing.publish.config.json

Lines 48 to 54 in fde0a56

	{
	"path_to_root": "_csharplang",
	"url": "https://github.com/dotnet/csharplang",
	"branch": "main",
	"include_in_build": true,
	"branch_mapping": {}
	},

Specify which files to import and what path to publish them under:

docs/docfx.json

Lines 50 to 70 in fde0a56

	{
	"files": [
	"csharp-9.0/*.md",
	"csharp-10.0/*.md",
	"csharp-11.0/*.md",
	"csharp-12.0/*.md",
	"csharp-13.0/*.md",
	"csharp-14.0/*.md"
	],
	"src": "_csharplang/proposals",
	"dest": "csharp/language-reference/proposals",
	"exclude": [
	"**/README.md",
	"inactive/**",
	"rejected/**",
	"csharp-9.0/nullable-reference-types-specification.md",
	"csharp-9.0/nullable-constructor-analysis.md",
	"csharp-9.0/nullable-parameter-default-value-analysis.md",
	"csharp-9.0/skip-localsinit.md"
	]
	},

Specify where feedback on the docs should go:

docs/docfx.json

Line 180 in fde0a56

"_csharplang/**.*": "https://github.com/dotnet/csharplang/issues/new?template=docs-feedback.yml",

Add required metadata such as ms.service, author, ms.author, ms.date, title, and description. You might also need to turn off the edit button.

[Evangelink]

Great, I think that would help a lot. Now I need to see how to duplicate some of the checks on this repo to ensure we are not having issues on linting or other features you have here.