[6.15.z] Remove sleeps and make cron expression more accurate #15209
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Cherrypick of PR: #15172
Problem Statement
The sleeps in these tests result in inconsistent behavior and the cron expression is malformed, leading to 2 seperate faliures. This PR will fix both.
Solution
Removed the sleep by setting max_tries to 20 on the task poll, reformatted the cron expression to always accurately set the sync time to 5 minutes after the plan is created. 5 minutes is required here due to slow interactions with the UI sometimes resulting in the product not being added until after the sync time had passed.
trigger: test-robottelo
pytest: tests/foreman/ui/test_contenthost.py -k 'test_positive_synchronize_custom_product_custom_cron_real_time'