[DOCS] Alert counts added to Entity pages

[jmikell821]

Related docs meta: #2477
PR: https://github.com/elastic/security-team/issues/4162
Dev: Kristof-Pierre C., Explore team

Affects Host, Network, and User details pages

• Removes the Unique IP KPI from the Host details page

On all detail pages:

• Place this component (AlertCountByRuleByStatus) next to AlertByStatus component
• Click the View Alerts button on the AlertByStatus component will open up a timeline filtered by the current host and an additional field: event.type: signal

The left component (Alert By Status) will be titled Alerts by Severity. The new component on the right will be titled Alerts by rule.

Global filters should apply to both components.

NOTE: If a user does not have Alert permissions, the card won't display.