statistics only option from executions-report api

Registered by ali abdelal

add the option to the executions-report API to only fetch the statistics.
also
add an estimation (in % and in seconds) of the remaining time if the execution still running

Blueprint information

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Priority:
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Drafter:
ali abdelal
Direction:
Needs approval
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Definition:
New
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Gerrit topic: https://review.opendev.org/#/q/topic:bp/mistral-executions-report-return-statistics-only

Addressed by: https://review.opendev.org/724606
    added statistics-only in report Api and a new field in statistics

Addressed by: https://review.opendev.org/725101
    added support statistics only for report execution API

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