Dashboards (and maybe other objects) should be callable by name via the URL

## What?
Today links to a dashboard are all by GUID, but GUIDs are different when illuminate dashboards are installled cluster to cluster. So there is no way to link to a dashboard that would work from one customer to another (say from another dashboard etc.

The same applies to the tab, although at least the GUID does not seem to change in that case, but still being able to have the link be ?Dashboard=Sources&Page=Overview rather than /dashboards/69cd229916bc990081ae4d2b?page=4067e46d-9b9c-40ea-a013-180bdd413f8b

## Why?

Now that you can use variables and markdown in multiple places in the product being able to easily do deep links around the product would be very helpful.

Or say from the main page of a dashboard have some descriptions of the different pages and links to them, like an index.

Yes, some links may not work if two have the same name etc, but those should be pretty edge case, and it could just fail somehow gracefully for those.

Start by tracing the dashboard and tab URL entry points described in the issue, comparing GUID-based links with the proposed name-based query parameters. Confirm how name resolution should work across installations, including duplicate names and graceful failure; done means dashboard and tab links can be shared between customers without installation-specific GUIDs.

Written by the indexing model from the issue text.