Update salsa CI pipeline

Update the pipeline definition to allow receive updates easier. On this proposal the jobs are instanced in the yaml https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/pipeline-jobs.yml.

In this way if a new test is added or updated into the pipeline-jobs.yml this project will get the benefit automatically.

MR-id: jobs-defined-by-salsa-ci-team

debian/.gitlab-ci.yml

-include: https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/salsa-ci.yml
-
-build:
-    extends: .build-unstable
-
-reprotest:
-    extends: .test-reprotest
-
-lintian:
-    extends: .test-lintian
-
-autopkgtest:
-    extends: .test-autopkgtest
-
-piuparts:
-    extends: .test-piuparts
+include:
+ - https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/salsa-ci.yml
+ - https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/pipeline-jobs.yml