Indicator of instanced cells

[AHeroicLlama]

https://discord.com/channels/1029499482028646400/1029512633319170133/1195803454694768711

Considerations:

1. Is this even present in the ESM, or are we looking at a hardcoding?
2. What is the purpose/value - might help guide the design
3. Where would it be useful displayed? In the select a cell drop-down? On the final map?

[pcrov]

Primary value for me is when I'm looking for loot/junk/npc to kill (usually for daily/weekly challenges) and want to prioritize places I won't be competing with other players. Most useful place to display it would be in the Search Results table in or next to the Location column (I'm typically using Search in all Spaces in this case.)

Aside from just consistency, a case for putting it on the Select Space drop-down as well would be when perusing through instanced cells to get a feel for their contents and making mental notes for what's available, supporting the use case above.

Including it on the final map with the other data (e.g. cell name, scale) would be nice too. I guess mostly for shared maps resulting from the above.