network: Show DNS6 parameters in details and connection editor

Fixes #1231
7 jobs for show-dns6-3-38 in 3 minutes and 36 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #1119447
build

00:02:01

 
  Test
passed #1119448
test

00:01:35

 
  Manual
manual #1119450
asan allowed to fail manual
asan
manual #1119449
allowed to fail manual
flatpak
manual #1119453
allowed to fail manual
msan
manual #1119451
allowed to fail manual
tsan
manual #1119452
allowed to fail manual
ubsan