Implement enabled field in runner controller

Timo Furrerrequested to merge
runner-controller-enabled-field into master

What does this MR do and why?

Implement enabled field in runner controller.

We need this field so that runner controllers are not enabled by default and get try to be used, before runner controllers are properly setup and connected.

References

Closes #583132

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Edited by Timo Furrer

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