Upgrade: Add PATH for patronictl; Override become_method in Molecule tests

[vitabaks]

Fixed:

  TASK [upgrade : Remove 'standby_cluster' parameter from DCS (if exists)] *******
 fatal: [10.172.2.20]: FAILED! => {"changed": false, "cmd": "patronictl -c /etc/patroni/patroni.yml edit-config -s standby_cluster=null --force", "msg": "[Errno 2] No such file or directory: b'patronictl': b'patronictl'", "rc": 2, "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []}

The problem was reproduced on Oracle Linux 8 - https://github.com/vitabaks/autobase/actions/runs/12208193286/job/34060985583

Additionally

Override become_method to su in molecule tests, as tests are executed under root and sudo is unnecessary.

Fixed:

  fatal: [10.172.0.20]: FAILED! => {"changed": false, "module_stderr": "sudo: PAM account management error: Authentication service cannot retrieve authentication info\nsudo: a password is required\n", "module_stdout": "", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}