Migrate direct Install-Module calls to use PSModule-Helpers internal feed

[raych1]

Follow-ups of using CFS for powershell module installation in Azure/azure-sdk-tools#15215

Problem

Several repo-specific test scripts directly call Install-Module to install Pester from the public PSGallery, bypassing the centralized PSModule-Helpers.ps1 helper.

The shared eng/common/scripts/Helpers/PSModule-Helpers.ps1 has been updated to route all module installs through the internal Azure Artifacts feed (https://pkgs.dev.azure.com/azure-sdk/public/_packaging/azure-sdk-tools/nuget/v2) instead of the public PSGallery. This change improves reliability and security by avoiding dependency on external package sources in CI pipelines. The eng/common changes (Verify-Resource-Ref.ps1 and run-pester-tests.yml) are already addressed in a separate PR.

However, the following repo-specific test scripts still call Install-Module directly and will continue installing from the public PSGallery:

Files that need changes

File	Line	Current Code
eng/scripts/tests/patchhelpers.tests.ps1	18	Install-Module Pester -Force -MinimumVersion 5.3.3
eng/scripts/tests/bomhelpers.tests.ps1	15	Install-Module Pester -Force -MinimumVersion 5.3.3
eng/scripts/tests/Automation-Sdk-UpdateMetadata.tests.ps1	15	Install-Module Pester -Force -MinimumVersion 5.3.3
eng/scripts/tests/Automation-Sdk-UpdateChangelog.tests.ps1	15	Install-Module Pester -Force -MinimumVersion 5.3.3

Suggested Fix

1. Dot-source PSModule-Helpers.ps1 at the top of each test script (if not already done):

   . "$PSScriptRoot/../../common/scripts/Helpers/PSModule-Helpers.ps1"

   (adjust relative path as needed for each file's location)

2. Replace direct Install-Module calls with the helper function:

   Install-ModuleIfNotInstalled "Pester" "5.3.3" | Import-Module

Why This Matters

• Reliability: The internal feed is more reliable for CI than the public PSGallery, which can have intermittent availability issues.
• Security: Using an internal feed reduces supply-chain risk from public package repositories.
• Consistency: All module installs should go through the same centralized helper to ensure uniform behavior across pipelines.