Allow curators to revalidate sumstats submissions where the minimum allowable number of rows is X

[jdhayhurst]

By default the minimum number of rows for a valid sumstats dataset is 100,000.
Just in the same way as when curators force as submission to be valid, they should be able to revalidate an invalid submission but set the minimum number of rows to whatever integer value they choose.

This has already been implemented in the sumstats service api: /v1/sum-stats/validate/<callback_id>. In the payload set the minrows attribute to an INT e.g. 10000.

[jdhayhurst]

this is an issue