upstream CI: Simplify pipelines enviroment creation

Several optimizations have been done to the pipelines, to make them
closer to what can be reproduced, with the existing scripts, in a
development environment:

- Use start.sh and build.sh scripts to build and start containers
- Use variables to configure different stages instead of using separate
  files
- Use a commom 'prepare_environment' to create the environment for every
  pipeline
- Use a single file defining testing steps (run_tests.yml)
- Remove Centos 7 pipelines
- Reduce the number of pipelines in the test matrix due to the amount of
  time that tests were using
- Use Azure "loop" (each) to create test groups

The above changes make the pipelines easier to understand and modify.

infra/image/build.sh

@@ -37,8 +37,7 @@ EOF
 
 name="ansible-freeipa-image-builder"
 hostname="ipaserver.test.local"
-# Number of cpus is not available in usptream CI (Ubuntu 22.04).
-# cpus="2"
+cpus="2"
 memory="3g"
 quayname="quay.io/ansible-freeipa/upstream-tests"
 deploy_server="N"