Add Threat Insights video to Release Kickoff

Why is this change being made?

In preparation for the 12.10 Release Kickoff, we are adding the Threat Insights group video onto the page

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what