Merge branch 'andrey-fix-parallel-selective-setup' into 'master'

Fix incorrect setup of KNAPSACK_TEST_FILE_PATTERN for selective e2e test execution

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/169397



Merged-by: Dan Davison <ddavison@gitlab.com>
Approved-by: Dan Davison <ddavison@gitlab.com>
Co-authored-by: Andrejs Cunskis <acunskis@gitlab.com>