Reduce the length of the nightly_win_extra_rmw_release.
Reduce the length of the nightly_win_extra_rmw_release.

This is because Jenkins uses the full pathname to build, and
with the longer name we run into Windows pathname restrictions.
Note that this is longer than what we truncate other windows
jobs to be, but we would lose too much information by
truncating to 15 characters.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@openrobotics.org>

ros2/ci,ros2/ci,ros2/ci