azurerm_[linux|windows]_function_app[_slot] - add support for vnet_image_pull_enabled property in 4.0

[jackofallops]

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Description

Supersedes #25249

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Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_linux_function_app - add support for vnet_image_pull_enabled property in 4.0
• azurerm_linux_function_app_slot - add support for vnet_image_pull_enabled property in 4.0
• azurerm_windows_function_app - add support for vnet_image_pull_enabled property in 4.0
• azurerm_windows_function_app_slot - add support for vnet_image_pull_enabled property in 4.0

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.

[jackofallops]

Tests looking fine in 4.0 mode, failures are region capacity issues, not related to change.

[jackofallops]

3.x tests looking ok, capacity problems again, pushed a couple fixes for 3.x mode in 6a2b7c3

[stephybun]

Thanks @jackofallops LGTM 👍

[github-actions]

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