[LogsDB] [Stack 8.19.22-SNAPSHOT] [oracle] Failing test daily: system test: (elastic-agent logs - systemstatistics) in oracle.system_statistics

- Stack version: 8.19.22-SNAPSHOT
- LogsDB: enabled
- Package: oracle
- Failing test: system test: (elastic-agent logs - systemstatistics)
- DataStream: system_statistics
- Owners:
- @elastic/obs-infraobs-integrations

Failure:
```
test case failed: one or more errors found while examining elastic-agent.logs2450367714: [0] found error "Unit state changed sql/metrics-default-sql/metrics-oracle-62e7d386-e24a-4f3f-8ef2-c59e319db4a0 (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/49550

Start by rerunning the named oracle system test for the elastic-agent logs systemstatistics case and inspect the oracle package setup for the system_statistics data stream. The work is done when the test no longer reports ORA-12541: TNS:no listener and the metricset remains healthy.

Written by the indexing model from the issue text.