Debugging fails with ENOENT when running JavaScript + AZD templates with package.json under src

See: https://github.com/microsoft/vscode-azurefunctions/issues/5128

I commented on the PR where this issue was introduced with a solution: https://github.com/Azure-Samples/functions-quickstart-javascript-azd-timer/pull/3#issuecomment-4918054709

Start by reading the linked vscode-azurefunctions issue and the solution described in the linked quickstart PR comment. Reproduce debugging with a JavaScript AZD template whose package.json is under src, then trace the ENOENT path failure. Done means debugging starts successfully without ENOENT.

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