Use correct constant for kubernetes ressource limits.

Merged username-removed-810624 requested to merge chrobbert/gitlab-ci-multi-runner:master into master

What does this MR do?

Fixes the Issue #1836 (closed). Use correct constants for limit names.

Why was this MR needed?

Wrong constant for limit names were used.

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

Fixes #1836 (closed)