Have shard management deletion pop-up advise deletion time [Enhancement]

[burnalting]

When deleting shards, the second pop-up advises that the shards will be deleted and it will take some time. As per ...

It is suggested, the process check the Index Shard Delete job to determine when the next shard deletion will occur and display that time. Perhaps a hint that the Index Shard Delete Job could be changed to effect the time.