[8.0](backport #29913) [Metricbeat] gcp.gke: fix overview dashboard

[mergify]

This is an automatic backport of pull request #29913 done by Mergify.

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• Start Time: 2022-01-19T16:44:56.055+0000

• Duration: 78 min 9 sec

• Commit: 388cd4f

Test stats 🧪

Test	Results
Failed	0
Passed	2691
Skipped	240
Total	2931

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