Fix incorrect setup of KNAPSACK_TEST_FILE_PATTERN for selective e2e test execution
What does this MR do and why?
Fix incorrect log statements for selective test execution setup. Because files_pattern
variable was set to empty string, it would always return true in the elsif
block and print confusing log statements like: https://gitlab.com/gitlab-org/gitlab/-/jobs/8097163235#L102
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Edited by Andrejs Cunskis