Saved Questions data selector lists all questions for collections with the same name

[flamber]

Describe the bug
When sub-collections has the same name in several parent-collections, then the Saved Question picker will show all questions from all the sub-collections, which can be confusing.
Seems like both BE and FE needs some adjustment.

To Reproduce

1. Create two parent collections, "Parent1" and "Parent2"
2. Then create a sub-collection within both parents called "same-child-name"
3. Create two questions, save "Q1" to "Parent1/same-child-name" and save "Q2" to "Parent2/same-child-name"
4. New question > Saved Questions > "Parent1" > "same-child-name" - it will show both questions, since the request is for /api/database/-1337/schema/same-child-name without any ID or parent to make the distinction.
   

Expected behavior
Only show the questions related to the specific collection selected.

Information about your Metabase Installation:
Tested 0.41.7 thru 0.44.0