Add SpecifyUser to Query Combo Box in Export Feed

[realVinayak]

Added a typeSearch to allow searching. Users will have to configure a formatter for SpecifyUser to see anything other than <Formatter not defined>

Testing instructions
0. Make sure you have a formatter defined for SpecifyUser table. Add one if not.

1. Go to ExportFeed resource in xml-editor.
2. Go to Run as user or Send completion notification to user field (which is query combo box)
3. Make sure you are able to search for different users in those combo boxes
   

It is rare that databases will have a formatter for specifyUser (but that's easy to add with xml-editor, so I think it is fine). Until #4312 is merged, SpecifyUser won't be visible in table list for visual editor. So, the following can be added to record object formatters to add a basic formatter for SpecifyUser

<format
    name="SpecifyUser"
    title="SpecifyUser"
    class="edu.ku.brc.specify.datamodel.SpecifyUser"
    default="true"
    >
    <switch single="true">
        <fields>
            <field>name</field>
        </fields>
    </switch>
</format>

[maxpatiiuk]

now that you identified the solution, I can see what might have caused it:

specify7/specifyweb/frontend/js_src/lib/components/QueryComboBox/useTypeSearch.tsx

Lines 37 to 38 in e2d9b08

	typeSearches.find(({ name }) => name === initialTypeSearch) ??
	typeSearches.find(({ table }) => table === relatedTable) ??

that code says that if type search wasn't explicitly passed, it would try to find a type search for the specify user table

probably I had a type search for specify user defined in my database when I was testing this, but your database doesn't?

if that is the case, your solution is good - this kind of stuff shouldn't be database dependent

and even better, if typesearch doesn't exist, we might be able to define one on the fly dynamically for any table (out of scope of this PR though)

[emenslin]

I did have to add the formater but it looks good and you can search for users.