[SecuritySolution] Re-score entities after an asset criticality bulk upload

[machadoum]

Summary

• Create new API /internal/risk_score/engine/schedule_now
• Fix storybook, it was broken due to some mock changes
• Update status API to return task status
• Add schedule risk engine panel to bulk asset criticality final step

How to test it?

• Enable asset criticality in stack management / Advanced settings
• Enable the risk engine
• Open the asset criticality page inside the Manage section
• Upload a valid file
• Verify that the new panel is present and that you can schedule the risk engine run by pressing the button

Checklist

Delete any items that are not applicable to this PR.

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