feat: Allow full page screenshot as run_on_failure

Author: kumy

src/SeleniumLibrary/__init__.py

@@ -550,6 +550,8 @@ def failure_occurred(self):
             self._running_on_failure_keyword = True
             if self.run_on_failure_keyword.lower() == "capture page screenshot":
                 self.capture_page_screenshot()
+            elif self.run_on_failure_keyword.lower() == "capture full page screenshot":
+                self.capture_full_page_screenshot()
             else:
                 BuiltIn().run_keyword(self.run_on_failure_keyword)
         except Exception as err: