Feature Request: Modify helloSecretWorld to work with Open Bao

[t-fine]

Is your feature request related to a problem? Please describe.

When we switch over to Open Bao from Vault, we should ensure the helloSecretWorld example service still works correctly.

Describe the solution you'd like.

The helloSecretWorld example service still works correctly and demonstrates how secrets can be used in Open Horizon.

Describe alternatives you've considered

No response

Additional context.

Current helloSecretWorld example service: https://github.com/open-horizon/examples/tree/master/edge/services/helloSecretWorld

[joewxboy]

This service is planned to be used as part of an official Open Horizon demo to illustrate how OpenBao is integrated with Open Horizon to facilitate dynamic runtime secrets binding with deployed workloads. As you work on this issue, please be thinking about how it might or could be enhanced to further illustrate this point.