Make Test262 results less verbose (#4090)

Changes:
- Don't dump each test output to stdout
- Upload test outputs as artifact to GitHub

JerryScript-DCO-1.0-Signed-off-by: Csaba Osztrogonác csaba.osztrogonac@h-lab.eu

tools/runners/run-test-suite-test262.py

@@ -184,7 +184,7 @@ def main(args):
                       [test262_harness_path,
                        '--command', command,
                        '--tests', args.test_dir,
-                       '--full-summary']
+                       '--summary']
 
     if 'excludelist_path' in args and args.mode == 'default':
         test262_command.extend(['--exclude-list', args.excludelist_path])