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Use atomics to avoid locking in InjectionPointRun()

This allows using injection points without having a PGPROC, like early at backend startup, or in the postmaster. The injection points facility is new in v17, so backpatch there. Reviewed-by: Michael Paquier <michael@paquier.xyz> Disussion: https://www.postgresql.org/message-id/4317a7f7-8d24-435e-9e49-29b72a3dc418@iki.fi

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src
- backend/utils/misc
  - injection_point.c
- tools/pgindent
  - typedefs.list

+298

-109

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