MIgrate all GCP dashboards to lens

[tommyers-elastic]

As part of this effort we should endeavour to get all our dashboards and visualizations conforming to the current best practices. Internal tooling can be used to validate that all dashboards and panels are up-to-date. The following checklist provides a summary of the guidlines:

• Apart from markdown panels, all visualisations should be built with lens
• All visualizations should be 'inline' (by value, not reference) - this is mostly done for GCP, except for one missing referenced input control panel (Dashboard [Metrics GCP] Compute Overview - missing visualization #5006)
• All input controls should use the new control panels, instead of the deprecated visualisation input controls (see above)
• All dashboards, or individual panels should be pre-filtered on data_stream.dataset to improve performance

The follow scripts will help with this effort https://github.com/flash1293/legacy_vis_analyzer

[endorama]

FYI some have been migrated in #5025

[botelastic]

Hi! We just realized that we haven't looked into this issue in a while. We're sorry! We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!