Make information displayed in EXPLORE grid more useful

[ltalirz]

Here come a few (not super urgent) suggestions on the information to display in the EXPLORE grid

• General: Replace the "Id" column with a "UUID" column (Ids are not transferrable and we use uuids everywhere else). In order to avoid too long fields, display only the first block of the UUID and show the full UUID as a tooltip on hover
• Codes: Take inspiration from the "Computers" view (e.g. show label, potentially computer?, input plugin)
• "Last modification time" seems to simply be the time the AiiDA database was imported. This is not very meaningful and does not need to be displayed in the grid view

[ltalirz]

I think these are still quite meaningful;
notifying @waychal for info (not urgent, at this point, though)

[waychal]

1. In REST API version v4, we have already replaced id with uuid.

2. & 3. lets discuss it together before making any changes.