[Identity] Instead of portal references, use the CLI

[sadasant]

In the Identity docs, instead of step by step references to the portal, use the CLI.

An example of a place where this would apply is: https://github.com/Azure/azure-sdk-for-js/pull/12858/files#diff-31491a657ddd6c0e783793b927ee6ef3ea1e846ed58486c0e901f4c72066dbd1R23

@azure/keyvault-secrets has some CLI examples that could be used: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/keyvault/keyvault-secrets/README.md

[github-actions]

Hi @sadasant, we deeply appreciate your input into this project. Regrettably, this issue has remained inactive for over 2 years, leading us to the decision to close it. We've implemented this policy to maintain the relevance of our issue queue and facilitate easier navigation for new contributors. If you still believe this topic requires attention, please feel free to create a new issue, referencing this one. Thank you for your understanding and ongoing support.