add skip for distribution event

[steveny91]

What does this PR do?

Couch version 3.4 introduced a new key in the _system api response:

"distribution_events": {
    "[email protected]": [
      [
        "2024-11-13T19:57:04Z",
        "nodeup"
      ]
    ],
    "[email protected]": [
      [
        "2024-11-13T19:57:04Z",
        "nodeup"
      ]
    ]
  }

Which we don't handle at the moment. This will skip over this key to make the integration still function.

Motivation:
https://datadoghq.atlassian.net/browse/AGENT-12655

Follow up:
https://datadoghq.atlassian.net/browse/AI-4598

Passes on 3.4.1 for me after patching.

  Running Checks
  ==============

    couch (8.0.0)
    -------------
      Instance ID: couch:1a8bdcb1f3798a84 [OK]
      Configuration Source: file:/etc/datadog-agent/conf.d/couch.d/couch.yaml
      Total Runs: 1
      Metric Samples: Last Run: 2,386, Total: 2,386
      Events: Last Run: 0, Total: 0
      Service Checks: Last Run: 4, Total: 4
      Average Execution Time : 433ms
      Last Execution Date : 2024-11-13 21:03:56 UTC (1731531836000)
      Last Successful Execution Date : 2024-11-13 21:03:56 UTC (1731531836000)


  Metadata
  ========
    config.provider: file
    config.hash: couch:1a8bdcb1f3798a84
    version.minor: 4
    version.patch: 1
    version.raw: 3.4.1
    version.scheme: semver
    version.major: 3
  

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.05%. Comparing base (7494a92) to head (853b8c1).
Report is 75 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
couch	95.40% <100.00%> (+0.44%)	⬆️
hive	?
hivemq	?
hudi	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
solr	?

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