GEC-119 Use ${SKA_DEFAULT_RUNNER}

Maik Nijhuisrequested to merge
gec-119-ska-default-runner into master

Use a variable runner @ the SKAO mirror of DP3. https://gitlab.com/ska-telescope/external/sdp-dp3-visibility-preprocessing/-/pipelines/1925967801 shows a run with this branch at SKAO.

Edited by Maik Nijhuis

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