Add milestones for all clusters

@SpickerHZB @frust45 we need to add milestones to roadmap for 2022.

Derive from cluster reports.

changed due date to February 25, 2022

added Critical Progress::2_ToDo labels

assigned to @jandt-desy

changed milestone to %Content for Annual reporting

added 1 deleted label

mentioned in issue #230 (closed)

mentioned in merge request !384 (merged)

mentioned in commit b619ba34

closed with merge request !384 (merged)