make regression tests more robust to swift USR changes

Summary: D77932015 fixed those tests after a Pika update. Let's make these tests more robust against internal compiler changes.

Reviewed By: iamirzhan

Differential Revision: D77934629

fbshipit-source-id: e7266ec77afd5aa902376d6e47e27624facebedf

Author: Catherine Gasnier

glean/lang/swift/tests/regression/displayNameSymbol.out

@@ -1,5 +1,5 @@
 {
   "@generated": null,
-  "facts_searched": { "scip.DisplayNameSymbol.1": 319 },
-  "full_scans": [ "scip.DisplayNameSymbol.1" ]
+  "facts_searched": { "scip.DisplayName.1": 1, "scip.DisplayNameSymbol.1": 1 },
+  "full_scans": [ ]
 }

glean/lang/swift/tests/regression/displayNameSymbol.perf

@@ -1,3 +1,3 @@
-query: scip.DisplayNameSymbol _
+query: scip.DisplayNameSymbol { displayName = "CGPoint" }
 perf: True
 transform: [gensort, []]