[bug #68358] [troff] make `pwh` request report existence and location of diversion trap

Update of bug #68358 (group groff):

                  Status:                    None => In Progress
             Assigned to:                    None => gbranden
         Planned Release:                    None => 1.25.0

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Follow-up Comment #1:

[https://lists.gnu.org/archive/html/groff/2026-05/msg00033.html Feedback on
this feature change sought on the _groff_ list.]

Illustration:


$ cat ATTIC/pwh-report-diversion-trap-demo.mm
.de DT
.tm BOING
..
.pwh
.di D
.tm inside diversion; reporting traps
.pwh
.tm setting diversion trap
.dt 2v DT
.pwh
.nf
foo
bar
.tm diversion trap should have sprung; reporting traps
.pwh
.tm clearing diversion trap and reporting again
.dt
.pwh
.di
.tm outside diversion; reporting traps
.pwh
$ ./build/test-groff -mm ATTIC/pwh-report-diversion-trap-demo.mm
pg@header       0
pg@footer       708000
inside diversion; reporting traps
setting diversion trap
DT      24000
BOING
diversion trap should have sprung; reporting traps
DT      24000
clearing diversion trap and reporting again
outside diversion; reporting traps
pg@header       0
pg@footer       708000




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