CI Pipeline Runs example/example.py

[moward98]

Altered logic in example/example.py to read the previously hardcoded vault_id from environment variables.

Added example/example.py to the validation workflow, and read OP_SERVICE_ACCOUNT_TOKEN and OP_VAULT_ID from GitHub secrets.

Altered the example client.secrets.resolve to resolve field from item created during the example.py item CRUD.

[github-actions]

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[MOmarMiraj]

Fixed up with Morgan and LGTM!