[Test Plan] [Metrics UI] Saved view URL state

[Zacqary]

Summary

This test plan covers the URL state for saved views (#90216)

Scenarios

• When loading the Inventory and Metrics Explorer pages with an empty URL state, the Saved View selector reads Default view (e.g. [KIBANA URL]/app/metrics/inventory)
• When loading the Inventory and Metrics Explorer pages with some parameters configured in the URL state — e.g. timestamp, filters, etc. — but no saved view state, the Saved View selector reads Default view (instead of No view selected). (You can get into this state by refreshing the page after loading it once)
• When selecting a Saved View from the Saved View selector, the URL updates to reflect the selected Saved View
• When loading the Inventory and Metrics Explorer pages with a Saved View in the URL state, the corresponding Saved View loads as expected

[elasticmachine]

Pinging @elastic/logs-metrics-ui (Team:logs-metrics-ui)

[neptunian]

Verified on BC2