azurerm_linux_web_app + azurerm_linux_web_app_slot - Set site_config.always_on as configured by the user during an update

[Apokalypt]

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Description

This PR adds the forgotten property site_config.always_on when the linux app service (slot or not) is updated. Currently, this property is not set during an update, which means that this value will be set to "false" by the API.
It also aligns the behavior of different app services.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
• I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
• I have used a meaningful PR title to help maintainers and other users understand this change and help prevent duplicate work.

Changes to existing Resource / Data Source

• I have added an explanation of what my changes do and why I'd like you to include them (This may be covered by linking to an issue above, but may benefit from additional explanation).
• I have written new tests for my resource or datasource changes & updated any relevent documentation.

Testing

Sorry, but I couldn't run acceptance tests because I don't have enough permissions in my team to make them run properly. However, some tests were run manually and some checks/tests were run directly with the API to make sure everything worked despite my technical limitations.

Note

I've added a control to prevent regression, but since I'm only controlling one property, wouldn't it be better to remove it? (this control has been added in a complete update but all other properties are not checked)

Change Log

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

• azurerm_linux_web_app - Set site_config.always_on as configured by the user during an update
• azurerm_linux_web_app_slot - Set site_config.always_on as configured by the user during an update

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 #25115

[Apokalypt]

UP 😄

[jackofallops]

Thanks @Apokalypt - LGTM 👍

[jackofallops]

Tests look fine:

[pacorreia]

Many thanks to all involved!

[github-actions]

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