[7.x][Transform][Rollup] add processing stats to record the time sp… (#53770) #54027
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add 2 additional stats: processing time and processing total which capture the
time spent for processing results and how often it ran. The 2 new stats
correspond to the existing indexing and search stats. Together with indexing
and search this now allows the user to see the full picture, all 3 stages.
backport: #53770