upstream ci: Run PR tests using a single job.

The usual scenario for PR checks is to execute only a few tests, and
searching for the results in several jobs makes it harder to find
issues.

By using a single job run the tests would take some more time to
complete, although not much, as only a small subset is executed, and
test verification would be easier and less error prone.

tests/azure/templates/fast_tests.yml

@@ -13,30 +13,12 @@ jobs:
 - template: playbook_fast.yml
   parameters:
     group_number: 1
-    number_of_groups: 3
+    number_of_groups: 1
     build_number: ${{ parameters.build_number }}
     scenario: ${{ parameters.scenario }}
     ansible_version: ${{ parameters.ansible_version }}
     python_version: '< 3.12'
 
-- template: playbook_fast.yml
-  parameters:
-    group_number: 2
-    number_of_groups: 3
-    build_number: ${{ parameters.build_number }}
-    scenario: ${{ parameters.scenario }}
-    ansible_version: ${{ parameters.ansible_version }}
-    python_version: '< 3.12'
-
-- template: playbook_fast.yml
-  parameters:
-    group_number: 3
-    number_of_groups: 3
-    build_number: ${{ parameters.build_number }}
-    scenario: ${{ parameters.scenario }}
-    ansible_version: ${{ parameters.ansible_version }}z
-    python_version: '< 3.12'
-
 # - template: pytest_tests.yml
 #   parameters:
 #     build_number: ${{ parameters.build_number }}