src/tests/JIT/Directed/tls/TlsFieldLibrary tests do not run #137482

I don't think this test actually executes; we'd see failures on ARM64 because managed tree is only built once and assumed to be platform neutral by the CI. https://dev.azure.com/dnceng-public/public/_build/results?buildId=1673291&view=ms.vss-test-web.build-test-results-tab is the outerloop that supposedly has this change.

I think this fell into a trap set by earlier changes that made src/tests/JIT/Directed tree different from other src/tests trees (the projects need to be listed in one of the files at the root of Directed).

Originally posted by @MichalStrehovsky in #136537 (comment)