[FIR IDE] Ensure prefixed test output file differs from the default one

analysis/analysis-api-fir/tests/org/jetbrains/kotlin/analysis/api/fir/components/AbstractExpressionPsiTypeProviderTest.kt

@@ -27,6 +27,6 @@ abstract class AbstractExpressionPsiTypeProviderTest : AbstractHLApiSingleFileTe
                 appendLine("PsiType: $psiType")
             }
         }
-        testServices.assertions.assertEqualsToFile(testDataFileSibling(".txt"), actual)
+        testServices.assertions.assertEqualsToTestDataFileSibling(actual)
     }
 }

analysis/analysis-api-fir/tests/org/jetbrains/kotlin/analysis/api/fir/components/AbstractFirGetSuperTypesTest.kt

@@ -43,6 +43,6 @@ abstract class AbstractFirGetSuperTypesTest : AbstractHLApiSingleFileTest(FirFro
                 }
             }
         }
-        testServices.assertions.assertEqualsToFile(testDataFileSibling(".txt"), actual)
+        testServices.assertions.assertEqualsToTestDataFileSibling(actual)
     }
 }

analysis/analysis-api-fir/tests/org/jetbrains/kotlin/analysis/api/fir/components/AbstractHLImportOptimizerTest.kt

@@ -25,8 +25,6 @@ abstract class AbstractHLImportOptimizerTest : AbstractHLApiSingleModuleTest(Fir
             unusedImportPaths.forEach(::appendLine)
         }
 
-        val expectedUnusedImports = testDataFileSibling(".imports")
-
-        testServices.assertions.assertEqualsToFile(expectedUnusedImports, actualUnusedImports)
+        testServices.assertions.assertEqualsToTestDataFileSibling(actualUnusedImports, extension = ".imports")
     }
 }

analysis/analysis-api-fir/tests/org/jetbrains/kotlin/analysis/api/fir/components/AbstractPsiTypeProviderTest.kt

@@ -44,7 +44,7 @@ abstract class AbstractPsiTypeProviderTest : AbstractHLApiSingleFileTest(FirFron
                 }
             }
         }
-        testServices.assertions.assertEqualsToFile(testDataFileSibling(".txt"), actual)
+        testServices.assertions.assertEqualsToTestDataFileSibling(actual)
     }
 
     private fun getContainingKtLightClass(