azurerm_windows[linux]_function[web]_app[slot] - remove 4.0 feature flag for test cases and update the health check schema

[xiaxyi]

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Description

PR Checklist

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Changes to existing Resource / Data Source

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Change Log

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• azurerm_windows[linux]_function[web]_app[slot] - remove 4.0 feature flag for test cases and update the health check schema

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #0000

Note

If this PR changes meaningfully during the course of review please update the title and description as required.