[Security Solution] fix alert flyout threat intelligence section not showing multiple values

[PhilippeOberti]

TODO let's discuss this approach. If we like it:

• write unit tests

Summary

This PR makes a small code change to fix the Threat Intelligence component rendered in the alert details flyout.
Currently that component only renders the first value for each field. This PR changes that logic to render all the values instead.

Before	After

As can be seen on the sceenshots above, we're now displaying multiple values vertically. This could be further improved by showing a Show more/Show less button when we have to many values.

Checklist

• Unit or functional tests were updated or added to match the most common scenarios
• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines
• Review the backport guidelines and apply applicable backport:* labels.

[elasticmachine]

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

[elasticmachine]

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