[LogsDB] [Stack 8.19.18-SNAPSHOT] [oracle] Failing test daily: system test: (elastic-agent logs - performance) in oracle.performance

- Stack version: 8.19.18-SNAPSHOT
- LogsDB: enabled
- Package: oracle
- Failing test: system test: (elastic-agent logs - performance)
- DataStream: performance
- Owners:
- @elastic/obs-infraobs-integrations

Failure:
```
test case failed: one or more errors found while examining elastic-agent.logs3582367509: [0] found error "Unit state changed sql/metrics-default-sql/metrics-oracle-3b18977d-90a8-4e3e-a97a-5c65d47868f5 (HEALTHY->DEGRADED): Error fetching data for metricset sql.query: cannot open connection: testing connection: user=\"sys\" standalone params={authMode:2 connectionClass: connectionClassLength:0 purity:0 newPassword: newPasswordLength:0 appContext: numAppContext:0 externalAuth:0 externalHandle: pool: tag: tagLength:0 matchAnyTag:0 outTag: outTagLength:0 outTagFound:0 shardingKeyColumns: numShardingKeyColumns:0 superShardingKeyColumns: numSuperShardingKeyColumns:0 outNewSession:0}: ORA-12541: TNS:no listener"
```

First build failed: https://buildkite.com/elastic/integrations/builds/45219

Latest 5 failed builds:
- https://buildkite.com/elastic/integrations/builds/45764
- https://buildkite.com/elastic/integrations/builds/45840
- https://buildkite.com/elastic/integrations/builds/45910
- https://buildkite.com/elastic/integrations/builds/45971
- https://buildkite.com/elastic/integrations/builds/46035

Start with the failing `elastic-agent logs - performance` system test for the `oracle` package and inspect the linked Buildkite failures, focusing on the `ORA-12541: TNS:no listener` connection error. Determine the relevant test setup and connection path; done means the performance data stream test runs without this connection error.

Written by the indexing model from the issue text.