[6.15.z] Fix flaky SyncPlans in cli_factory

[Satellite-QE]

Cherrypick of PR: #14337

Problem Statement

Some CLI SyncPlan tests are failing randomly. The reason is that cli_factory takes random interval (when not provided explicitly) in options and ignores that custom cron needs additional cron-interval option, so the tests fail on validation.

robottelo.exceptions.CLIFactoryError: Failed to create SyncPlan with data:
{ 'description': 'QpRNvtrDBf',
  'enabled': 'false',
  'interval': 'custom cron',
  'name': 'KwgvwcaNvc',
  'organization-id': 3,
  'sync-date': '2024-03-07 01:33:04'}
Command "sync-plan create" finished with status 70
stderr contains:
Could not create the sync plan:
  Cron expression is not valid!

Plus one small param fix forgotten in CLI refactor.

Solution

Do not pick custom cron randomly from factory and check the cron-interval is provided when custom cron is used.

PRT test Cases example

trigger: test-robottelo
pytest: tests/foreman/cli/test_syncplan.py

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman/cli/test_syncplan.py

[Satellite-QE]

PRT Result

Build Number: 6021
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/cli/test_syncplan.py --external-logging
Test Result : ================ 85 passed, 211 warnings in 2760.60s (0:46:00) =================