Cherry-pick from master
pr: #42920
Related to #42918
Previously the `CollectionTtlTimestamp` could be overflowed when the
guarantee_ts==1, which means using `Eventually` consistency level.
This patch use task timestamp, allocated by scheduler, to generate ttl
timestamp ignore the potential very small timestamp being used.
Also add overflow check for ttl timestamp calculated.
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Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
b1bbc56b54