Unify several ways to tracking backend type

Peter Eisentraut <peter@eisentraut.org>

Commit: 8e8a0becb335529c66a9f82f88e1419e49b458ae
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-03-13T13:01:10Z
Releases: 13.0
Unify several ways to tracking backend type

Add a new global variable MyBackendType that uses the same BackendType
enum that was previously only used by the stats collector.  That way
several duplicate ways of checking what type a particular process is
can be simplified.  Since it's no longer just for stats, move to
miscinit.c and rename existing functions to match the expanded
purpose.

Reviewed-by: Julien Rouhaud <rjuju123@gmail.com>
Reviewed-by: Kuntal Ghosh <kuntalghosh.2007@gmail.com>
Reviewed-by: Alvaro Herrera <alvherre@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/c65e5196-4f04-4ead-9353-6088c19615a3@2ndquadrant.com

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