Hide "Add summary" in review drawer without draft notes

Phil Hughesrequested to merge
ph/631090/hideSummarizeReviewWithoutDraftNotes into master

What does this MR do and why?

Only render the SummarizeMyReview button when draftsCount is above zero, and await the mutation in SummarizeMyReview so a rejected request resets the loading state.

References

#631090 (closed)

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