Summary:
Address issue #73904 by adding an optional `sortByLabel` to the QuickPick class which determines whether the picker re-sorts the result list when the user types in the input field.
If true, the picker applies a sort to order results by the index of the first appearance of the input in the label.
For backwards compatibility, this field is true by default.
https://github.com/microsoft/vscode/issues/73904
Test Plan:
attached video shows behavior both before and after
{F167292605}
note: there aren't any existing tests on what happens when the query input changes in the QuickPick
Reviewers: dalongi, ericblue, hchau
Reviewed By: ericblue
Differential Revision: https://phabricator.intern.facebook.com/D16203434
Signature: 16203434:1562878837:5413e3852f2bd04c8e81b9fe5c4a08127dfe3b65
