[Metrics UI] Add functional tests for Inventory view

[estermv]

There are some functional tests for the Inventory view that checks that the waffle map loads and has tooltips. To complete the functional tests we should add:

• Change some filters and verify that the waffle map gets updated
• Add some query in the search bar and verify that the waffle map gets updated (#116868)
• Verify that the waffle map can be sorted (#116868)
• Change something in the legend and verify that the waffle map gets updated (#116868)
• Verify that you can group the nodes (#116868)
• Verify that the history appears at the bottom of the page (#116868)
• Switch to the table view
• Change some filters and verify that the table gets updated
• Add some query in the search bar and verify that the table gets updated

NOTE: this is not an exhaustive list of what needs to be tested. Check the linked issue for more details.

[elasticmachine]

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

[smith]

This is not planned.