[Logs Explorer] Add test suite for Dataset Selector

[tonyghiani]

📓 Summary

Closes #160627

This implementation adds the majority of the tests listed down here for the Log Explorer current implementation.

✅ Flaky Test Runner - x50 executions

↳ Discover Log-Explorer profile
   ↳ Columns selection initialization and update
     ↳ when the log explorer profile loads
       ↳ should initialize the table columns to logs' default selection
       ↳ should restore the table columns from the URL state if exists
   ↳ Customizations
     ↳ when Discover is loaded with the log-explorer profile
       ↳ DatasetSelector should replace the DataViewPicker
       ↳ the TopNav bar should hide the New, Open and Save options
       ↳ should add a searchable deep link to the profile page
       ↳ should render a filter controls section as part of the unified search bar
   ↳ DatasetSelection initialization and update
     ↳ when the "index" query param does not exist
       ↳ should initialize the "All log datasets" selection
     ↳ when the "index" query param exists
       ↳ should decode and restore the selection from a valid encoded index
       ↳ should fallback to the "All log datasets" selection and notify the user of an invalid encoded index
     ↳ when navigating back and forth on the page history
       ↳ should decode and restore the selection for the current index
   ↳ Dataset Selector
     ↳ without installed integrations or uncategorized data streams
       ↳ when open on the first navigation level
         ↳ should always display the "All log datasets" entry as the first item
         ↳ should always display the unmanaged datasets entry as the second item
         ↳ should display an error prompt if could not retrieve the integrations
         ↳ should display an empty prompt for no integrations
       ↳ when navigating into Uncategorized data streams
         ↳ should display a loading skeleton while loading
         ↳ should display an error prompt if could not retrieve the data streams
         ↳ should display an empty prompt for no data streams
     ↳ with installed integrations and uncategorized data streams
       ↳ when open on the first navigation level
         ↳ should always display the "All log datasets" entry as the first item
         ↳ should always display the unmanaged datasets entry as the second item
         ↳ should display a list of installed integrations
         ↳ should sort the integrations list by the clicked sorting option
         ↳ should filter the integrations list by the typed integration name
         ↳ should display an empty prompt when the search does not match any result
         ↳ should load more integrations by scrolling to the end of the list
       ↳ when clicking on integration and moving into the second navigation level
         ↳ should display a list of available datasets
         ↳ should sort the datasets list by the clicked sorting option
         ↳ should filter the datasets list by the typed dataset name
         ↳ should update the current selection with the clicked dataset
       ↳ when navigating into Uncategorized data streams
         ↳ should display a list of available datasets
         ↳ should sort the datasets list by the clicked sorting option
         ↳ should filter the datasets list by the typed dataset name
         ↳ should update the current selection with the clicked dataset
       ↳ when open/close the selector
         ↳ should restore the latest navigation panel
         ↳ should restore the latest search results
       ↳ when switching between integration panels
         ↳ should remember the latest search and restore its results for each integration

Note on serverless tests suite

For testing the feature in a serverless environment, we are copying all the tests into the x-pack/test_serverless folder until #161574 is merged, which will provide a new space to write tests independently from the deployment type, avoiding then tests duplication.

New browser service utils for Network conditions simulation

To properly test that this feature works correctly under poor network conditions or offline scenarios, the browser service now exposes some new methods for altering network conditions on demand.

Also, network profiles to match the network profiles provided by Chrome debugger have been created.

In case the browser is not of chromium type and the driver does not support the network simulation, these methods throw an error that can be caught for skipping the affected test.

[apmmachine]

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[elasticmachine]

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

[tonyghiani]

The part regarding the FTR changes have been splitted into #163633 for an easier review, it will be merged into this PR when merged into main.

[Kerry350]

Great work! 👏 Thanks for the very thorough test suite, and for expanding the Browser utils.

[kibana-ci]

💚 Build Succeeded

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• Commit: 1bdba72

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
discoverLogExplorer	222.7KB	223.2KB	+551.0B

History

• 💚 Build #149235 succeeded 45f8fe4
• 💔 Build #149146 failed e83756a
• 💔 Build #149105 failed 62929b8
• 💚 Build #148903 succeeded 88579b0
• 💔 Build #148862 failed 23e4462
• 💔 Build #148792 failed 4fc6616

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