[Discover] Adjust NoData screen

[jughosta]

• Closes User shouldn't(?) be allowed to create a saved search on Kibana when there is a single adhoc-dataview and no other dataviews #150317

Summary

This PR:

• hides "Use without saving" button from NoData screen on Discover page to align with Dashboard and Lens behaviour
• allows to open a saved search via URL even if there are no data views present (before NoData screen was shown instead).

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 46ebb44

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
discover	529.8KB	529.9KB	+49.0B

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	14	16	+2
securitySolution	413	417	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	15	17	+2
securitySolution	492	496	+4
total			+6

History

• 💚 Build #138891 succeeded 556f0b9
• 💔 Build #138833 failed 91b0839

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@elasticmachine merge upstream

cc @jughosta

[kertal]

Code LGTM, thx for fixing this 🙏 . Tested locally and works like expected