[wasm] Build Wasm.Build.Tests only on the WBT job, on CI

[radical]

On the _WasmBuildTests job, we build the library tests also, which aren't used at all. So, disable that. And we don't need to build Wasm.Build.Tests for the regular build job, so disable there.

This saves 10-12 mins of build time.

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Author:	radical
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Labels:	area-Infrastructure-mono
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Author:	radical
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Labels:	arch-wasm, area-Infrastructure-mono
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[lewing]

It couldn't you set TestAssemblies=false and avoid the wasm specific condition in the libraries setup?

[radical]

It couldn't you set TestAssemblies=false and avoid the wasm specific condition in the libraries setup?

It is used in other cases, like the linker tests (see https://github.com/dotnet/runtime/blob/main/eng/pipelines/libraries/execute-trimming-tests-steps.yml#L7, and https://github.com/dotnet/runtime/blob/main/eng/pipelines/runtime-linker-tests.yml#L79). The intention is clearer with having an explicit property.

[radical]

runtime (Libraries Test Run release coreclr windows x64 Debug) is #56810

[lewing]

I'd kind of prefer TestWasmBuild=true and dropping the only idea but it isn't a strong preference

[radical]

I'd kind of prefer TestWasmBuild=true and dropping the only idea but it isn't a strong preference

With the TestAssemblies=false change, your suggestion makes sense. I will add it to another PR that I have open.