Fix grafana datasources and tests for multi wc

[Elias-elastisys]

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What does this PR do / why do we need this PR?

Makes sure there is always a default datasource in grafana even with multiple WCs.
Fixes grafana datasource test to include all wc datasources.

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Checklist

• Proper commit message prefix on all commits
• Change checks:
  • The change is transparent
  • The change is disruptive
  • The change requires no migration steps
  • The change requires migration steps
  • The change upgrades CRDs
  • The change updates the config and the schema
• Documentation checks:
  • The public documentation required no updates
  • The public documentation required an update - [link to change](set-me)
• Metrics checks:
  • The metrics are still exposed and present in Grafana after the change
  • The metrics names didn't change (Grafana dashboards and Prometheus alerts are not affected)
  • The metrics names did change (Grafana dashboards and Prometheus alerts were fixed)
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[aarnq]

Nice job!

[AlbinB97]

👍

[Xartos]

Is this test working now? Doesn't this also need a check if it only is one WC or not?

[Elias-elastisys]

True, thought I tested but think i had the wrong naming still then. Fixed now, for some reason I also had to revert my change that added parent(). I tested this with both single and multi wc.