View end crawl date (enhancement)

[crarugal]

This could be an enhancement in W3ACT that would help curators see the end crawl dates of targets.
There are two parts to this:

1. Adding the filtering of targets that fall between a speficified period, similar to the Reports page. Currently there is no way to apply this type of filter in Targets>List targets (https://www.webarchive.org.uk/act/targets)
   

Filtering between dates is possible in the Reports view (https://www.webarchive.org.uk/act/reports)

2. Viewing the end crawl dates of listed targets (Targets>Listed targets). This would be useful because we could export a list of targets and view the end crawl dates, with that information we could easily single out the required targets and edit the metadata as needed.
   
   There are currently five columns, perhaps the last column ("Scheduled for crawl?") could be replaced with the end crawl date as I do not believe the current fith column to be of much use; this would need clarification from curators.

The crawl end date is in the target table