Streamline test output (JabRef#10762)

* Try to make test outputs more readable

* Fix verbose test output

* Revert gradle optimization

build.gradle

@@ -443,33 +443,27 @@ test {
 }
 
 testlogger {
-    theme 'standard-parallel'
+    // See https://github.com/radarsh/gradle-test-logger-plugin#configuration for configuration options
+
+    theme 'standard'
+
     showPassed false
     showSkipped false
+
+    showCauses false
+    showStackTraces false
 }
 
 tasks.register('databaseTest', Test) {
     useJUnitPlatform {
         includeTags 'DatabaseTest'
     }
-
-    testLogging {
-        // set options for log level LIFECYCLE
-        events = ["FAILED"]
-        exceptionFormat "full"
-    }
 }
 
 tasks.register('fetcherTest', Test) {
     useJUnitPlatform {
         includeTags 'FetcherTest'
     }
-
-    testLogging {
-        // set options for log level LIFECYCLE
-        events = ["FAILED"]
-        exceptionFormat "full"
-    }
 }
 
 tasks.register('guiTest', Test) {