Delay MoveShard job until old and new leader ready - BTS-1110 #17569
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This addresses https://arangodb.atlassian.net/browse/BTS-1110 .
The problem is that if a MoveShard which switches leadership begins to
work, although the supposed leader has not yet assumed its leadership,
then we get stuck. The old leader does no longer assume leadership and
as a consequence cannot resign and the MoveShard job is stuck.
This is the backport for 3.8.
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