add de milestone check-in meeting

Why is this change being made?

This will be a brief meeting just to check on the status of the Milestone and review what might be as risk for not getting finished.

Does this MR meet the acceptance criteria?

Yes FYI @gitlab-data/gitlab-data-engineers

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