[ML] Restore data counts on resuming data frame analytics #67937
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Now that data frame analytics jobs can be resumed straight into
the inference phase, we need to ensure data counts are persisted
at the end of the analysis step and restored when the job is
started again.
This commit removes the need for storing the progress on start
as a task parameter. Instead, when the task gets assigned we now
restore all stats by making a call to the get stats API. Additionally,
we now ensure that an allocated task that hasn't had its
StatsHolder
restored yet is treated as a stopped task from the get stats API, which
means we will report the stored stats.
Relates #67623