50874: fix handling of tty signals for jobs in the current shell when waiting for the right side of a pipeline.

Reverts 15bf8ace (workers/50134).  Thanks to Jun T. for debugging assistance.

Issues came down to two things:
1. update_job() may be called on a process group leader even when a
   signal was NOT sent to any process in that process group.  This
   caused jobs to be resumed or backgrounded incorrectly or in the
   wrong order.
2. When there is a current-shell complex command (in braces) on the
   right side of a pipeline, external processes within it have their
   own process groups, but a tty signal sent to such a process should
   be treated as if received by the whole complex command.

This fixes:
* Suspend/resume of a foreground pipeline within a shell function
* Interrupt or suspend/resume of processes in a pipeline ending in { ... }
* Interrupt of such a pipeline after exit of the last process in { ... }

These affected interactive shells only (MONITOR set plus tty signals).

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