presubmit: do not include long_text in uploaded findings

The long_text includes stack_trace[1] which is very verbose and not
providing much value. If user really need stacktrace or long_text,
they can access it by going to the build page.

[1]: https://screenshot.googleplex.com/5dcPwjNrtizEVBK

Change-Id: I2c5a5c2703875906f4ccaa1c8b1e83fe3a2f6115
Bug: 404837554
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6486346
Reviewed-by: Gavin Mak <gavinmak@google.com>
Auto-Submit: Yiwei Zhang <yiwzhang@google.com>
Commit-Queue: Yiwei Zhang <yiwzhang@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>

recipes/recipe_modules/presubmit/api.py

@@ -242,13 +242,10 @@ class PresubmitApi(recipe_api.RecipeApi):
                          []), findings_pb.Finding.SEVERITY_LEVEL_INFO)
     ]:
       for result in results:
-        message = result.get('message', '')
-        if result.get('long_text', None):
-          message += '\n\n' + result['long_text']
         for loc in result.get('locations', []):
           f = findings_pb.Finding()
           f.CopyFrom(base_finding)
-          f.message = message
+          f.message = result.get('message', '')
           f.severity_level = level
           f.location.file_path = loc['file_path'].replace(self.m.path.sep, '/')
           if loc.get('start_line', None):

recipes/recipe_modules/presubmit/tests/execute.py

@@ -353,7 +353,7 @@ def GenTests(api):
                           end_line=1,
                           end_column=5,
                       )),
-                  message='typo!!\n\nreplace foo with bar',
+                  message='typo!!',
                   severity_level=findings_pb.Finding.SEVERITY_LEVEL_WARNING),
               findings_pb.Finding(
                   category='chromium_presubmit',