Implement PrimaryOnlyService for DDL coordinators

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    • Fully Compatible
    • Sharding 2021-02-22, Sharding 2021-03-08
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      The new drop collection procedure for sharded cluster (introduced in SERVER-52809) is not resilient yet to shutdown of the coordinator shard. This ticket is to implement the coordinator as a PrimaryOnlyService to add such resiliency. 

              Assignee:
              Tommaso Tocci
              Reporter:
              Tommaso Tocci
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