Replace postmaster.c's own backend type codes with BackendType

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 18d67a8d7d30884655d65910b82781d9360819a6
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-11-14T14:06:16Z
Releases: 18.0
Replace postmaster.c's own backend type codes with BackendType

Introduce a separate BackendType for dead-end children, so that we
don't need a separate dead_end flag.

Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/a102f15f-eac4-4ff2-af02-f9ff209ec66f@iki.fi

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