[ci] Introduce MR label ci_large for enabling large tests.

Lars Bilkerequested to merge
bilke/ogs:ci_large-label into master

Added new label ci_large which enables large tests in MR pipelines. Combine with ci::linux only to get faster feedback on large ctests.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?
Edited by Lars Bilke

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