The server responded with: ***'ok': False, 'error': 'already_reacted'***

[FlorentClarret]

Environment details (Operating System, Cloud provider, etc):

https://github.com/DataDog/integrations-core/actions/runs/7184356048/job/19565229824?pr=16394

Describe what happened:

When I comment on an already commented PR, I get this error when the bot is triggered:

Traceback (most recent call last):
Event PR: https://github.com/DataDog/integrations-core/pull/16394
  File "/usr/local/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/local/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/local/lib/python3.7/site-packages/slapr/__main__.py", line 36, in <module>
    main(config)
  File "/usr/local/lib/python3.7/site-packages/slapr/main.py", line 74, in main
    channel_id=config.slack_channel_id,
  File "/usr/local/lib/python3.7/site-packages/slapr/slack.py", line 98, in add_reaction
    self._backend.add_reaction(timestamp=timestamp, emoji=emoji, channel_id=channel_id)
  File "/usr/local/lib/python3.7/site-packages/slapr/slack.py", line 62, in add_reaction
    self._client.reactions_add(channel=channel_id, name=emoji, timestamp=timestamp)
  File "/usr/local/lib/python3.7/site-packages/slack/web/client.py", line 1347, in reactions_add
    return self.api_call("reactions.add", json=kwargs)
  File "/usr/local/lib/python3.7/site-packages/slack/web/base_client.py", line [17](https://github.com/DataDog/integrations-core/actions/runs/7184356048/job/19565229824?pr=16394#step:3:18)1, in api_call
    return self._event_loop.run_until_complete(future)
  File "/usr/local/lib/python3.7/asyncio/base_events.py", line 587, in run_until_complete
    return future.result()
  File "/usr/local/lib/python3.7/site-packages/slack/web/base_client.py", line [22](https://github.com/DataDog/integrations-core/actions/runs/7184356048/job/19565229824?pr=16394#step:3:23)6, in _send
    return SlackResponse(*******data, **res***).validate()
  File "/usr/local/lib/python3.7/site-packages/slack/web/slack_response.py", line 176, in validate
    raise e.SlackApiError(message=msg, response=self)
slack.errors.SlackApiError: The request to the Slack API failed.
The server responded with: ***'ok': False, 'error': 'already_reacted'***
Slack message timestamp: 170[23](https://github.com/DataDog/integrations-core/actions/runs/7184356048/job/19565229824?pr=16394#step:3:24)67606.[39](https://github.com/DataDog/integrations-core/actions/runs/7184356048/job/19565229824?pr=16394#step:3:40)8589
Existing emojis: speech_balloon, review_started
Is merged: False
Mergeable state: blocked
Emojis to add (ordered) : comment
Emojis to remove        : speech_balloon

Describe what you expected:

No failures

Steps to reproduce the issue:

1. Open a PR
2. Comment on it and wait for the emoji to be added to your message
3. Comment again

Additional notes-

It's a new issue, We did not have this problem before this PR I think