List data imports by datetime in drop down menu

[damianooldoni]

@bramdhondt found this issue, which is worth to be reported.

At the moment the data imports in drop down menu are ordered alphabetically by column Name, actually the only column of the table.
Doing this a typical problem arises: 10, 100, 101, 110, ... appear before 2. 20, 200, 201, ... appear before 3 etc.
Or, if you flip the order, 99 come before 9, etc.
Screenshot from the LIFE RIPARIAS Alert tool instance of GBIF Alert follows at the end of the issue.

I suggest to:

1. Add column Datetime.
2. Move datetime information from column Name to column Datetime.
3. Order the imports by Datetime, most recent first by default

The dropdown menu would look like this (again, using the LFIE RIPARIAS Alert tool as example):

Name	Datetime
Data import # 457	July 27, 2023, 1:26 a.m.
Data import # 456	July 26, 2023, 1:29 a.m.
Data import # 455	July 25, 2023, 1:35 a.m.
...	...
Data import # 102	July 30, 2022, 1:01 a.m.
Data import # 101	July 29, 2022, 1:02 a.m.
Data import # 100	July 28, 2022, 1:01 a.m.
...	...
Data import # 20	May 8, 2022, 1:01 a.m.
...	...
Data import # 11	April 29, 2022, 1:01 a.m.
Data import # 10	April 28, 2022, 1:01 a.m.
...	...
Data import # 3	April 21, 2022, 1:01 a.m.
Data import # 2	April 20, 2022, 1:01 a.m.
Data import # 1	April 19, 2022, 9:53 a.m.

[niconoe]

That's been fixed now, thanks @damianooldoni and @bramdhondt for the report!