feat(appservice): add support for PHP 8.4 in Linux

[g-cadici]

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Description

Adding support for PHP 8.4 in Linux Web Apps and Linux WebApp Slot
Updated documentation with new version support.

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.
  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

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 relevant documentation.
• I have successfully run tests with my changes locally. If not, please provide details on testing challenges that prevented you running the tests.
• (For changes that include a state migration only). I have manually tested the migration path between relevant versions of the provider.

Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

Linux Webapp test:

make acctests SERVICE='appservice' TESTARGS=' -run=TestAccLinuxWebApp_withPhp84' TESTTIMEOUT='60m'
==> Checking that code complies with gofmt requirements...
==> Checking that Custom Timeouts are used...
==> Checking that acceptance test packages are used...
TF_ACC=1 go test -v ./internal/services/appservice -run=TestAccLinuxWebApp_withPhp84 -timeout 60m -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccLinuxWebApp_withPhp84
=== PAUSE TestAccLinuxWebApp_withPhp84
=== CONT  TestAccLinuxWebApp_withPhp84

The test above builds the resource well with php 8.4

Linux WebApp Slot test:

make acctests SERVICE='appservice' TESTARGS=' -run=TestAccLinuxWebAppSlot_withPhp84' TESTTIMEOUT='60m'
==> Checking that code complies with gofmt requirements...
==> Checking that Custom Timeouts are used...
==> Checking that acceptance test packages are used...
TF_ACC=1 go test -v ./internal/services/appservice -run=TestAccLinuxWebAppSlot_withPhp84 -timeout 60m -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccLinuxWebAppSlot_withPhp84
=== PAUSE TestAccLinuxWebAppSlot_withPhp84
=== CONT  TestAccLinuxWebAppSlot_withPhp84

Resource created

Change Log

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

azurerm_linux_web_app - support for PHP 8.4
azurerm_linux_web_app_slot - support for PHP 8.4

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 #30278

[catriona-m]

Thanks @g-cadici LGTM!

[github-actions]

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