Fix ssh secrets for den launcher with org

[mkandler]

When launching a cluster for an organization via Den, there were two issues:

• Cluster is originally saved with default creds that we always overwrite
• Creds are switched into the org folder automatically (e.g. mkandler/ssh-sky-key -> runhouse/ssh-sky-key) when saving

So.

• Added a field to skip the creds setup for Den on-demand clusters
• Automatic folder switching only happens if the Secret doesn't have an _rns_folder

Wondering if some of that folder logic can be removed entirely? Especially with some of the upcoming image/env changes.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: runhouse/resources/hardware/cluster.py

Function	Unhandled Issue
__init__	ValueError: Could not locate secret ssh-sky-key _... Event Count: 1

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[mkandler]

• Fix ssh secrets for den launcher with org #1432 👈 (View in Graphite)
• Set sky secret on den clusters #1428
• main

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[mkandler]

Merge activity

• Nov 18, 10:57 AM EST: A user started a stack merge that includes this pull request via Graphite.
• Nov 18, 11:01 AM EST: Graphite rebased this pull request as part of a merge.
• Nov 18, 11:02 AM EST: A user merged this pull request with Graphite.