Merge pull request #17497 from anitazha/randomizeonce

timer: add new feature FixedRandomDelay=

diff --cc man/org.freedesktop.systemd1.xml
Simple merge

diff --cc man/systemd.timer.xml
Simple merge

diff --cc src/core/dbus-timer.c
Simple merge

diff --cc src/core/timer.c
Simple merge

diff --cc src/core/timer.h
Simple merge

diff --cc src/shared/bus-unit-util.c
Simple merge

diff --cc test/fuzz/fuzz-unit-file/systemd-tmpfiles-clean.timer
Simple merge