Fix post-commit failure after pr/30205.

[shunping]

The PR #30205 introduced a bug of early termination when there is any exception in batch copy/delete. As a result, the error code is not propagated correctly and one of our post-commit tests failed.

AssertionError: BeamIOError not raised
self = <apache_beam.io.gcp.gcsfilesystem_integration_test.GcsFileSystemIntegrationTest testMethod=test_rename_error>

    @pytest.mark.it_postcommit
    def test_rename_error(self):
      num_copies = 10
      srcs = [self.INPUT_FILE] * num_copies
      dests = [
          self.gcs_tempdir + '/%s_%d' % (self.INPUT_FILE, i)
          for i in range(num_copies)
      ]
      self.fs.copy(srcs, dests)
      new_names = [
          self.gcs_tempdir + '/%s_%d' % ("renamed", i) for i in range(num_copies)
      ]
      # corrupt one of the destination names
      bad_name = self.gcs_tempdir + '/errorbadwrong'
      dests[int(num_copies / 2)] = bad_name
>     with self.assertRaises(BeamIOError):
E     AssertionError: BeamIOError not raised

apache_beam/io/gcp/gcsfilesystem_integration_test.py:127: AssertionError

addresses #28398

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[shunping]

cc'ed @Abacn

[Abacn]

LGTM

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