[enhancement] avoid log printing when tenant does not exist

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/pulsar/issues) and found nothing similar.

### Motivation

we should throw metadata not found exceptions to avoid printing those ugly stack traces.

### Solution

_No response_

### Alternatives

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

The issue does not name any files, tests, or entry points. Start by tracing how requests for a nonexistent tenant handle metadata-not-found conditions and where the stack trace is logged. Done means the appropriate metadata-not-found exception is thrown and the absent-tenant case no longer prints an ugly stack trace.

Written by the indexing model from the issue text.