[7.x] [Observability] Exploratory View initial skeleton (#94426)

[kibanamachine]

Backports the following commits to 7.x:

• [Observability] Exploratory View initial skeleton ([Observability] Exploratory View initial skeleton #94426)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 6a0d5d7
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
observability	248	299	+51

Async chunks

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

id	before	after	diff
observability	326.9KB	391.1KB	+64.2KB

Page load bundle

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

id	before	after	diff
observability	26.6KB	35.0KB	+8.4KB
uptime	18.6KB	18.6KB	+23.0B
total			+8.4KB

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

cc @shahzad31