Review integration testing tasks with GHA (for the all pg version matrix on ubuntu)

[klando]

also please pay attention to the tasks with the following conditions:

tests/integration/targets/postgresql_slot/tasks/postgresql_slot_initial.yml:  when: ansible_facts.distribution == 'CentOS' and ansible_facts.distribution_major_version == '8'
tests/integration/targets/postgresql_slot/tasks/postgresql_slot_initial.yml:  when: (ansible_facts.distribution_major_version != '8' and ansible_facts.distribution == 'CentOS') or ansible_facts.distribution != 'CentOS'
tests/integration/targets/setup_postgresql_db/tasks/main.yml:  when: ansible_facts.distribution == 'CentOS' and ansible_facts.distribution_major_version == '8'
tests/integration/targets/setup_postgresql_db/tasks/main.yml:  when: ansible_facts.distribution == 'CentOS' and ansible_facts.distribution_major_version == '8'
tests/integration/targets/postgresql_lang/tasks/main.yml:# Only run on CentOS 7 because there is a stack trace on CentOS 8 because the module
tests/integration/targets/postgresql_lang/tasks/main.yml:    - ansible_facts.distribution == 'CentOS'
tests/integration/targets/postgresql_user_obj_stat_info/tasks/postgresql_user_obj_stat_info.yml:    when: ansible_facts.distribution == 'CentOS' and ansible_facts.distribution_major_version == '8'
tests/integration/targets/postgresql_user_obj_stat_info/tasks/postgresql_user_obj_stat_info.yml:    when: (ansible_facts.distribution_major_version != '8' and ansible_facts.distribution == 'CentOS') or ansible_facts.distribution != 'CentOS'

Originally posted by @Andersson007 in https://github.com/ansible-collections/community.postgresql/issues/158#issuecomment-951581433