[App Configuration] : Handle pagination of Get-AzAppConfigurationKeyValue

[DanielMicrosoft]

Description

Fixes #23731

Add partial custom class to fix the nextLink issue and generate correct URI for pagination.

Checklist:

• Test with < 100 results
• Test with > 100 results
• Test with > 200 results
• Scenario test? (not sure about this as they dont exist for module), added pester test
• Changelog

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

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[Copilot]

Pull Request Overview

This PR fixes a pagination issue (GitHub #23731) where Get-AzAppConfigurationKeyValue fails to retrieve results beyond the first 100 records. The API returns relative @nextLink URLs, but the AutoRest-generated code expects absolute URLs. The fix adds a custom partial class implementation to convert relative URLs to absolute ones before pagination continues.

Key changes:

• Added custom C# override for pagination handling in GetAzAppConfigurationKeyValue_Get
• Added Pester test to verify pagination works with >100 results
• Updated ChangeLog to document the fix

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/AppConfiguration/AppConfigurationdata.Autorest/custom/GetAzAppConfigurationKeyValue_Get.cs	New partial class that overrides pagination to handle relative nextLink URLs by converting them to absolute URLs
src/AppConfiguration/AppConfigurationdata.Autorest/test/AzAppConfigurationKeyValue.Tests.ps1	Added test case to verify pagination returns all results when >100 records exist
src/AppConfiguration/AppConfiguration/ChangeLog.md	Updated with fix description and GitHub issue reference