scrypted: unified shutdown-cleaner array covers streams + listeners + timers

Scrypted's Scripts sandbox doesn't release a previous load's resources
before constructing a new Provider instance, so anything long-lived
survives a re-paste. Previously we hand-rolled cleanup via two
separate globalThis hooks: __viewportListenerCleaners (camera event
listeners) and __viewportRegisterInterval (the 5-minute re-register
timer). Anything else — in-flight ffmpeg children, TCP sockets to
the firmware, the per-stream stats interval — leaked across reloads.

Visible symptom: re-pasting the script during an active stream left
the old stream's ffmpeg + socket running against a dead Provider
instance, accumulating across reloads until the host was restarted.

Unify all cleanup into one globalThis array, __viewportShutdownCleaners,
that every long-lived resource pushes onto. The next start() snapshots
and drains it before doing anything else. Resources covered:

  - 5-minute re-register interval (clearInterval)
  - Every camera + child-device event listener (reg.removeListener)
  - Every in-flight stream's AbortController (abort.abort, which the
    existing abort listeners chain into socket.destroy() + ffmpeg
    SIGTERM + clearInterval on the stats logger)

Each cleanup is removed from the array when the resource naturally
ends (stream timeout / stopStream), so the list stays compact across
many stream cycles rather than growing forever.

Snapshot-before-walk avoids the iteration-skip bug where a stream
abort fires its abort listener, which splices the closure out of the
same array we're iterating. Snapshot the array, clear the original,
then walk the snapshot.

Doesn't address the 'Unknown' status panel in Scrypted Scripts UI —
that's a separate cosmetic issue (we don't implement a lifecycle
interface that reports running state).

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