Sync eng/common directory with azure-sdk-tools for PR 1517 (#17578)
Sync eng/common directory with azure-sdk-tools for PR 1517 (#17578)

* Add chagelogpath to Update-ChangeLog.ps1

* Make PackageName and ServiceDirectory not mandatory, test ChangelogPath

Co-authored-by: Chidozie Ononiwu <301d19fba573b360a93464351d7ca3ed97357016@microsoft.com>
Azure/azure-sdk-for-python,Azure/azure-sdk-for-python,Azure/azure-sdk-for-python,Azure/azure-sdk-for-python