Add env var check for worker runtime in StartHostAction #4198
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Adds a check to StartHostAction to use the environment variable "FUNCTIONS_WORKER_RUNTIME" if available, before displaying the Wizard Prompt.
This enables setting the runtime through environment variables as was the case in the past.
Issue describing the changes in this PR
resolves #4193
Pull request checklist
Note: I was unable to run or write unit tests and only validated manually by running the tool against a function with/without environment variables set:https://github.com/Azure/azure-functions-core-tools/blob/v4.x/CONTRIBUTING.md#running-the-test-suite
I was able to run the tests and added a unit test. It would be helpful if the link above was updated.