Find Usages: Add file grouping to test data

idea/testData/findUsages/kotlin/findFunctionUsages/javaAndKotlinOverrides.results.txt

@@ -1,2 +1,2 @@
-Unclassified usage (29: 18) override fun foo(t: String) {
-Unclassified usage (3: 17) public void foo(String s) {
+[javaAndKotlinOverrides.0.kt] Unclassified usage (29: 18) override fun foo(t: String) {
+[javaAndKotlinOverrides.1.java] Unclassified usage (3: 17) public void foo(String s) {

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinOverloadAndExtensionUsages.results.txt

@@ -1,7 +1,7 @@
-Function call (11: 11) a.foo(0, "")
-Function call (11: 7) x.foo(1, 2)
-Function call (25: 5) foo(t)
-Function call (30: 7) a.foo(1, "")
-Function call (35: 9) foo(t)
-Function call (39: 5) foo(s)
-Function call (3: 18) super<A>.foo(t)
+[kotlinOverloadAndExtensionUsages.0.kt] Function call (11: 7) x.foo(1, 2)
+[kotlinOverloadAndExtensionUsages.0.kt] Function call (25: 5) foo(t)
+[kotlinOverloadAndExtensionUsages.0.kt] Function call (30: 7) a.foo(1, "")
+[kotlinOverloadAndExtensionUsages.0.kt] Function call (35: 9) foo(t)
+[kotlinOverloadAndExtensionUsages.0.kt] Function call (39: 5) foo(s)
+[kotlinOverloadAndExtensionUsages.1.kt] Function call (11: 11) a.foo(0, "")
+[kotlinOverloadAndExtensionUsages.1.kt] Function call (3: 18) super<A>.foo(t)

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTopLevelMethodUsages.results.txt

@@ -1,5 +1,5 @@
-Callable reference (6: 23) val methodRef = ::processRequest()
-Function call (10: 9) processRequest()
-Unclassified usage (6: 30) String s = ServerPackage.processRequest();
-Unclassified usage (9: 30) return ServerPackage.processRequest();
-Usage in import (3: 15) import server.processRequest
+[kotlinTopLevelMethodUsages.1.kt] Callable reference (6: 23) val methodRef = ::processRequest()
+[kotlinTopLevelMethodUsages.1.kt] Function call (10: 9) processRequest()
+[kotlinTopLevelMethodUsages.1.kt] Usage in import (3: 15) import server.processRequest
+[kotlinTopLevelMethodUsages.2.java] Unclassified usage (6: 30) String s = ServerPackage.processRequest();
+[kotlinTopLevelMethodUsages.2.java] Unclassified usage (9: 30) return ServerPackage.processRequest();

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTraitImplThroughDelegate.results.txt

@@ -1,2 +1,2 @@
-Function call (11: 53) fun test(twdwi: TraitWithDelegatedWithImpl) = twdwi.foo()
-Unclassified usage (7: 14) some.foo();
+[kotlinTraitImplThroughDelegate.0.kt] Function call (11: 53) fun test(twdwi: TraitWithDelegatedWithImpl) = twdwi.foo()
+[kotlinTraitImplThroughDelegate.1.java] Unclassified usage (7: 14) some.foo();

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTraitNoImplThroughDelegate.results.txt

@@ -1,2 +1,2 @@
-Function call (11: 51) fun test(twdni: TraitWithDelegatedNoImpl) = twdni.foo()
-Unclassified usage (7: 14) some.foo();
+[kotlinTraitNoImplThroughDelegate.0.kt] Function call (11: 51) fun test(twdni: TraitWithDelegatedNoImpl) = twdni.foo()
+[kotlinTraitNoImplThroughDelegate.1.java] Unclassified usage (7: 14) some.foo();