test: print full exception format for test failures

exceptionFormat = "short" prints only the exception class and line,
swallowing assertion messages. GoogleEventsTest embeds the API response
in its assertion message, which CI was discarding, making the failure
undiagnosable from logs alone.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: jvmvik

build.gradle

@@ -64,7 +64,7 @@ test {
 
     testLogging {
         events "passed", "skipped", "failed"
-        exceptionFormat = "short"
+        exceptionFormat = "full"
         showStackTraces = true
         showStandardStreams = true
     }