MULE-6999: File Transport delays the processing of files when pollingFrequency attribute is uncomfortably narrow
(cherry picked from commit e8d937b)
(cherry picked from commit 198c593)
MULE-6999: File Transport delays the processing of files when pollingFrequency attribute is uncomfortably narrow

_ Extracting test utils from AbstractFileFunctionalTestCase to FileTestUtils
(cherry picked from commit e1cedae)
(cherry picked from commit f15cef0)