Fix reported time in seconds in metrics when backup are >24h

[Skunnyk]

• When backup duration is >24h, the .seconds conversion only convert the second of the day, not the full duration.
• This fix Reported time in metrics/logs is wrong when backup > 24h #606

[adejanovski]

Hi @Skunnyk, thanks for sending this PR!

Issue: The integration tests are failing due to this change:

Traceback (most recent call last):
Feature: Integration tests
  File "/home/runner/work/cassandra-medusa/cassandra-medusa/medusa/backup_node.py", line 199, in handle_backup
    enable_md5_checks_flag, backup_name, config, monitoring)
  File "/home/runner/work/cassandra-medusa/cassandra-medusa/medusa/backup_node.py", line 257, in start_backup
    update_monitoring(actual_backup_duration, backup_name, monitoring, node_backup)
  File "/home/runner/work/cassandra-medusa/cassandra-medusa/medusa/backup_node.py", line 337, in update_monitoring
    monitoring.send(tags, actual_backup_duration.total_seconds)
  File "/home/runner/work/cassandra-medusa/cassandra-medusa/medusa/monitoring/__init__.py", line 54, in send
    return self._monitoring_driver.send(tags, value)
  File "/home/runner/work/cassandra-medusa/cassandra-medusa/medusa/monitoring/local.py", line 36, in send
    self._persist_metric(metric)
  File "/home/runner/work/cassandra-medusa/cassandra-medusa/medusa/monitoring/local.py", line 40, in _persist_metric
    data = json.dumps(metric)
  File "/opt/hostedtoolcache/Python/3.6.15/x64/lib/python3.6/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/opt/hostedtoolcache/Python/3.6.15/x64/lib/python3.6/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/opt/hostedtoolcache/Python/3.6.15/x64/lib/python3.6/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/opt/hostedtoolcache/Python/3.6.15/x64/lib/python3.6/json/encoder.py", line 180, in default
    o.__class__.__name__)
TypeError: Object of type 'builtin_function_or_method' is not JSON serializable

[Skunnyk]

Woopsie, was tired I guess, used .total_seconds instead of calling the function .total_seconds() :)

[sonarcloud]

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[adejanovski]

Looks good now. Thanks @Skunnyk