[Security Solution] add expandable flyout investigation section

[PhilippeOberti]

Summary

This previous PR added the Highlighted Fields component to the expandable flyout right section overview tab. The mocks have slightly changed and the Highlighted Fields are now displayed under the Investigation expandable section.

This PR covers the following

• create new Investigation section
• move highlighted fields inside investigation section

How to test

• add xpack.securitySolution.enableExperimental: ['securityFlyoutEnabled'] to the kibana.json file
• run yarn es snapshot --license trial, yarn test:generate and yarn start --no-base-path
• go to the Alerts page, and click on the expand detail button on any row of the table
• navigate to the Overview tab

Run tests and storybook

• node scripts/storybook security_solution to run Storybook
• npm run test:jest --config ./x-pack/plugins/security_solution/public/flyout to run the unit tests
• yarn cypress:open-as-ci but note that the integration/e2e tests have been written but are now skipped because the feature is protected behind a feature flag, disabled by default. To check them, add 'securityFlyoutEnabled' here

https://github.com/elastic/security-team/issues/6070

Checklist

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Unit or functional tests were updated or added to match the most common scenarios
• Any UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser)

[elasticmachine]

Pinging @elastic/security-threat-hunting (Team:Threat Hunting)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 4ce2b46
• Storybooks Preview

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
securitySolution	3804	3805	+1

Async chunks

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

id	before	after	diff
securitySolution	15.8MB	15.8MB	+1.4KB

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
securitySolution	432	435	+3

Total ESLint disabled count

id	before	after	diff
securitySolution	512	515	+3

History

• 💔 Build #115795 failed 2a4d71c

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

[christineweng]

Desk tested and LGTM 🚀

[christineweng]

I created OverviewSectionProps here https://github.com/elastic/kibana/pull/154196/files#diff-281670d8d141832d8cdf6812a535538b36c45e77e20ed0e06360907e55d305d8R11 maybe we can reuse this?

[PhilippeOberti]

like I answered here, I like having the props colocated with the component, and I prefer writing identical ones instead of sharing them... Would you be opposed to that?