[Metrics] Fix functional tests for tooltip

[neptunian]

Tooltip functional test is commented out in this PR because it's failing after commenting back in Metrics UI Home Page test suite it belongs to which was commented out here #106650 due to flakey Saved Views tests.

• After [Unified Observability] update network fields #134471 was merged the field we used for getting network in/out has changed. Tests for the tooltip metric values are broken due to the fact that host.network.ingress.bytes and host.network.egress.bytes doesn't exist in the es archive data so the data needs to be updated. Note the ECS fields were introduced in 7.14 and may not make sense in this archive data as we agreed in [Unified Observability] Metrics overview table is not showing RX or TX metrics although they're available #131152 (comment) that users before this version would not get the data, so we could simply update the values to '-' which is correct for <7.14 and test for older versions that there is a value. I also think we can simplify this test and don't need to test for exact values as its covered elsewhere, perhaps just checking values exist and the tooltip is showing for the first node in the waffle map
• The other thing breaking which only happens consistently in CI and not locally is the tooptip is not showing at all

[elasticmachine]

Pinging @elastic/infra-monitoring-ui (Team:Infra Monitoring UI)

[roshan-elastic]

Hey @neptunian - checking if this is still needed?

It looks like this impacts Inventory but checking if it impacts anything else?

Trying to understand the value of performing this work over other work (so I can prioritise).

[neptunian]

I believe I resolved this so I will close it. However ALL of our tests for the Home Page (inventory) are currently being skipped since last month. We should try to fix these before the release. #157713. CC @smith