[ES3] Fix onboarding tiles to new design

[sphilipse]

Summary

This adapts the onboarding guide for Elasticsearch to:

• use in-page tiles
• remember its guide selection in local storage
• actually switch the code correctly on the start page

Screen.Recording.2025-01-23.at.15.48.16.mov

UPDATED SCREEN RECORDING:

Screen.Recording.2025-01-23.at.19.55.30.mov

[daveyholler]

This is looking good, Sander. A couple of initial feedback requests:

1. Can we ensure the index prompt is the same width for both "UI" and "Code" views? I'm not digging the changing width
2. Can we tighten up the spacing on the EuiHorizontalRule? The margin="s/m" prop should help

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: a394885

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
searchIndices	182.5KB	182.4KB	-105.0B

History

• 💔 Build #269810 failed 116ca11
• 💔 Build #269726 failed 1824ca6

[kibanamachine]

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[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
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[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create automatically backports add a backport:* label or prevent reminders by adding the backport:skip label.
You can also create backports manually by running node scripts/backport --pr 208069 locally