[Guided onboarding] Implement search E2E guide

[alisonelizabeth]

This PR completes the E2E search guide. Changes include adding the manual step completion popover and fixing the search experiences step url.

How to test

1. This is best to test on cloud. This PR has been deployed there. To reset the guide, use the example plugin and update the step ID to add_data.
2. Click "Create Elasticsearch index"
3. Select "Use a connector"
4. Create an index.
5. Use Dev Tools to index any document into the created index in step 4.
6. Step 1 should be marked as complete, and you can finish the guide.

Fixes #138998

JFDtjsehCf.mp4

[elasticmachine]

Pinging @elastic/platform-onboarding (Team:Journey/Onboarding)

[alisonelizabeth]

@elasticmachine merge upstream

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: d5d7220
• Cloud Deployment

Metrics [docs]

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
guidedOnboarding	24.7KB	25.2KB	+461.0B

Unknown metric groups

ESLint disabled in files

id	before	after	diff
osquery	1	2	+1

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
fleet	58	64	+6
osquery	108	113	+5
securitySolution	440	446	+6
total			+19

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
fleet	66	72	+6
osquery	109	115	+6
securitySolution	517	523	+6
total			+20

History

• 💚 Build #84938 succeeded 40815e1
• 💚 Build #84925 succeeded 9c64fed

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[yuliacech]

Thanks a lot for completing this guide, @alisonelizabeth!
I tested on your Cloud deployment and was able to complete the guide with a web crawler index. I noticed that we have a minor UI issue with the manual completion popover (it should not scroll with the page) and open an issue to track that.

[alisonelizabeth]

I'm going to go ahead and merge this so others can start testing the flow. @kellyemurphy if you have any feedback on the copy, I can open up a separate PR.