Merge #6512: ci: avoid killing the CI script itself on functional test error

8413621 ci: avoid killing the CI script itself on functional test error (UdjinM6)

Pull request description:

  ## Issue being fixed or feature implemented
  We kill CI script on test errors and it can't collect logs.

  ## What was done?
  Set `CI_FAILFAST_TEST_LEAVE_DANGLING` env variable to avoid that.

  ## How Has This Been Tested?
  1a69226: https://gitlab.com/dashpay/dash/-/jobs/8727924503

  ## Breaking Changes

  ## Checklist:
  - [ ] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [ ] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  PastaPastaPasta:
    utACK 8413621

Tree-SHA512: 9fcebcc22da2461f549bdf8b6c476df5a6537b4fdd1d147c473aa5ed8eef40604f5ed9df1414fefb0c920c18c4b3bffa8c82ee129fa90e9f785fff4f5cca9681

Author: PastaPastaPasta

.gitlab-ci.yml

@@ -3,6 +3,7 @@ image: "ubuntu:jammy"
 variables:
   DOCKER_DRIVER: overlay2
   FAST_MODE: "false" # when "true", only run linter on arm and unit/functional tests on linux64, skip everything else
+  CI_FAILFAST_TEST_LEAVE_DANGLING: "1"  # Gitlab CI does not care about dangling process and setting this variable avoids killing the CI script itself on error
 
 workflow:
   rules: