feat: update sample to use official azure sdk

[bcho]

Reason for Change:

Update the identity binding example to use azidentity sdk

Requirements

• squashed commits
• included documentation
• added unit tests and e2e tests (if applicable).

Issue Fixed:

Please answer the following questions with yes/no:

Does this change contain code from or inspired by another project? If so, did you notify the maintainers and provide attribution?

• yes
• no

Notes for Reviewers:

[enj]

Minor comments.