fix(snapshot): update last snapshot time across members #7968
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Addresses DO-79.
We see frequent snapshots in an HA cluster because of the leadership re-election because of leader crash/shutdown. The local variable that we use for snapshot frequency is not synchronized across alphas. So each alpha thinks differently about the time the last snapshot was taken.
Copy of #7965 to master
(cherry picked from commit 43055bf)
This change is