Fixes #12751 - Usability improvements for object selector

[kkthxbye-code]

Fixes: #12751

• Adds preselected filters
• Applies the filter on selection instead of requiring the search button to be clicked.

The typescript change was because of a bug that was also present for the Saved Filter field. If a collapsible field is defaulted to be shown, the list will not populate when opening like it is supposed to, but only when the user starts typing.

I was a bit uncertain about the selector_fields name, selector_default or selector_default_fields might be better. Feedback appreciated.

The default fields were taken from the initial PR adding selector fields. I looked at what fields were removed from the forms and added them as pre-selected fields.

[ITJamie]

im wondering should we make a separate issue to mark this as fixing as #12751 lists several issues with the selector. this pr fixes part 2 of the list of issues.

[jeremystretch]

@ITJamie this is a great example of why it's so important to ensure each feature request conveys a concise, discrete enhancement and to not bundle multiple initiatives in a single issue. If you don't believe this PR fully resolves the FR, I'd suggest breaking out the remaining items into separate FRs so that this can move forward.

[jeremystretch]

Thanks @kkthxbye-code!

[c-mege]

@kkthxbye-code : thank you !