observability: write debug.zip directly to S3

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

Getting a debug.zip requires an operator to download it, and then forward to the support team, typically with SendSafely. This can be slow, depending upon the operator’s internet connection, and requires several steps. Overall this delays a support response. It’s arguably not great for chain-of-custody.

**Describe the solution you'd like**

An option for the CRDB cluster to send the debug.zip directly to an S3 bucket. This would be faster, and the file will be in a position for sharing.

From a UX perspective, it could start as a CLI option. One could also imagine a DB Console UI, or SQL syntax.

In a first version, the user would need to create the S3 bucket, configure permissions, and share the URL. In a future version, one could imagine a CRL-managed bucket and automatic notification & sharing.

Jira issue: CRDB-22516