Add API support for env-dut files

Add necessary API for handling env-dut files.
Fix in the same time remaining env.dut.yaml reference
Tested with https://git.lavasoftware.org/montjoie/lavacli/-/tree/env-dut

Signed-off-by: Corentin LABBE <clabbe@baylibre.com>
16 jobs for env-dut in 16 minutes and 36 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #127085
amd64
dispatcher-debian-10

00:02:27

passed #127087
amd64
dispatcher-debian-11

00:02:29

passed #127086
amd64
server-debian-10

00:03:04

passed #127088
amd64
server-debian-11

00:05:32

 
  Analyze
passed #127089
amd64-dind
bandit-sast

00:00:54

passed #127090
amd64
black

00:00:34

passed #127091
amd64
code_quality

00:00:21

passed #127096
amd64
codespell

00:00:17

passed #127092
amd64
coverage

00:06:48

61.01%
passed #127093
amd64
dockerfiles

00:00:16

passed #127095
amd64
pylint

00:03:04

passed #127094
amd64
schemas

00:00:29

 
  Build
passed #127098
amd64
debian/10

00:01:14

passed #127097
amd64
doc

00:00:36

passed #127099
amd64-dind
docker-amd64-dispatcher

00:04:02

passed #127100
amd64-dind
docker-amd64-server

00:04:11