Add monitoring of dandisets/ superdataset for "up to dateness"

[yarikoptic]

Inspired by

• Doesn't update superdataset properly any more. backups2datalad process is "stuck" backups2datalad#39

We should be updating the https://github.com/dandi/dandisets/ pretty much daily -- the single process shouldn't be taking too long since we are not doing data fetches there etc. So we need to configure a check which would check for the latest commit of https://github.com/dandi/dandisets/ and if it is older than e.g. 3 days -- report a fail. Requires research in how to accomplish it with upptime.

[jwodder]

@yarikoptic It appears that Upptime can only check whether a given host or URL is successfully reachable over TCP and/or HTTP; it can't run arbitrary health checks.

[yarikoptic]

that sucks. Filed

• https://github.com/orgs/upptime/discussions/948

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