Issue #3198494: Cron option settings for stale file threshold is not respected

This closes #3198494 by removing hard-coded value of 1-week as stale file threshold in advagg_cron function. Hard-coded value is replaced with stale_file_threshold config setting as expected.

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assigned to @thallesvf

added 3 commits

• e254a319...b2363249 - 2 commits from branch project:8.x-4.x
• e19466fa - Remove hard-coded 1-week value from function advagg_cron and replace with...

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