Milestones 2022 for all clusters

@SpickerHZB @andreas.klotz @frust45 and myself:

Please add milestones (derived from reports) until 2022-02-28, the latest.

• 👉 Review here
• 👉 Folder for sources

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To do:

• Backbone: @jandt-desy
• Cloud: @SpickerHZB @andreas.klotz
• Software: @frust45
  • Via !393 (merged) waiting for 👍 by WPs
• @jandt-desy and all: Overall

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Note

• I propose to do this in this one MR, to see the overall roadmap review at once and also merge in one go.

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Closes #195 (closed)