FUNCTIONS_WORKER_RUNTIME required in flex consumption app settings

### Version

Currently using 4.2.2

### Description

[Flex consumption plans have deprecated the FUNCTIONS_WORKER_RUNTIME app setting](https://learn.microsoft.com/en-us/azure/azure-functions/functions-app-settings#flex-consumption-plan-deprecations), and in fact it can't be added through normal means.

Despite that, Core Tools still requires the setting to be present in order to run locally, and automatically adds it to my local settings, de-syncing my local and hosted settings.

### Steps to reproduce

Create a flex consumption app and run it.

Start by reproducing the issue with Core Tools 4.2.2 using a Flex consumption app, then compare the hosted app settings with the generated local settings. Done means the local run no longer requires or automatically adds FUNCTIONS_WORKER_RUNTIME for Flex consumption apps.

Written by the indexing model from the issue text.