[Miniflare 3] Avoid using temporary directory if possible

[mrbbot]

Miniflare 2 persisted data in-memory between setOptions() calls when *Persist options were disabled. Whilst workerd has in-memory storage for Durable Objects, this is reset when workerd is restarted (i.e. when setOptions() is called). To retain Miniflare 2 behaviour in Miniflare 3, we actually persist to a temporary directory when *Persist options are disabled. There are cases where we don't need the temporary directory though: if we have no storage bindings configured, cache is false, and unsafeEphemeralDurableObjects is true. This change ensures we don't write to the temporary directory in these cases.

Ref: https://github.com/cloudflare/workers-sdk/issues/4167

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