ci: azure: Update to use stages

Follow what we do in GitLab CI where we break the jobs up in to stages
such that if earlier and often quicker sanity tests fail we don't run
everything else.

Signed-off-by: Tom Rini <trini@konsulko.com>

.azure-pipelines.yml

@@ -9,7 +9,9 @@ variables:
   container_option: -u 0
   work_dir: /u
 
-jobs:
+stages:
+- stage: testsuites
+  jobs:
   - job: tools_only_windows
     displayName: 'Ensure host tools build for Windows'
     pool:
@@ -199,6 +201,8 @@ jobs:
           export PATH=/opt/gcc-11.1.0-nolibc/arm-linux-gnueabi/bin:$PATH
           test/nokia_rx51_test.sh
 
+- stage: test_py
+  jobs:
   - job: test_py
     displayName: 'test.py'
     pool:
@@ -381,6 +385,8 @@ jobs:
           # Some tests using libguestfs-tools need the fuse device to run
           docker run "$@" --device /dev/fuse:/dev/fuse -v $PWD:$(work_dir) $(ci_runner_image) /bin/bash $(work_dir)/test.sh
 
+- stage: world_build
+  jobs:
   - job: build_the_world
     displayName: 'Build the World'
     pool: