Fail LocalFilesystemToGCSOperator if src does not exist (#22772)

Fix #22705.

Fail LocalFilesystemToGCSOperator if the src file does not exist

`src` argument of LocalFilesystemToGCSOperator accept either list of source file path or a single source file path as a string. In the case of a single source file path we are using [glob](https://github.com/apache/airflow/blob/main/airflow/providers/google/cloud/transfers/local_to_gcs.py#L111) to parse the file path and glob return empty list if file path does not exist. In the next step, we iterate on this list and call [hook api](https://github.com/apache/airflow/blob/main/airflow/providers/google/cloud/transfers/local_to_gcs.py#L123) to update the file since the list is empty control is not going inside loop and task is succeeding even if the source file is not available.

Change 
- Raise an exception if [filepath](https://github.com/apache/airflow/blob/main/airflow/providers/google/cloud/transfers/local_to_gcs.py#L111) list is empty

After this change below task will fail if example-text.txt does not exist

```
upload_file = LocalFilesystemToGCSOperator(
        task_id="upload_file",
        src="example-text.txt",
        dst=DESTINATION_FILE_LOCATION,
        bucket=BUCKET_NAME,
    )

```

Author: pankajastro

airflow/providers/google/cloud/transfers/local_to_gcs.py

@@ -109,6 +109,8 @@ def execute(self, context: 'Context'):
         )
 
         filepaths = self.src if isinstance(self.src, list) else glob(self.src)
+        if not filepaths:
+            raise FileNotFoundError(self.src)
         if os.path.basename(self.dst):  # path to a file
             if len(filepaths) > 1:  # multiple file upload
                 raise ValueError(

tests/providers/google/cloud/transfers/test_local_to_gcs.py

@@ -81,6 +81,17 @@ def test_execute(self, mock_hook):
             object_name='test/test1.csv',
         )
 
+    def test_execute_with_empty_src(self):
+        operator = LocalFilesystemToGCSOperator(
+            task_id='local_to_sensor',
+            dag=self.dag,
+            src="no_file.txt",
+            dst='test/no_file.txt',
+            **self._config,
+        )
+        with pytest.raises(FileNotFoundError):
+            operator.execute(None)
+
     @mock.patch('airflow.providers.google.cloud.transfers.local_to_gcs.GCSHook', autospec=True)
     def test_execute_multiple(self, mock_hook):
         mock_instance = mock_hook.return_value