[Stack 8.19.17-SNAPSHOT] [oracle] Failing test daily: system test: (elastic-agent logs - systemstatistics) in oracle.system_statistics

- Stack version: 8.19.17-SNAPSHOT
- 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.logs4114246543: [0] found error "Unit state changed sql/metrics-default-sql/metrics-oracle-a496fa2b-0714-4398-94b5-9d9f2e079469 (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/45081

Latest failed builds:
- https://buildkite.com/elastic/integrations/builds/45169

Start with the oracle package's system_statistics data stream and the failing system test, then review the first failed and latest Buildkite runs linked in the issue. Determine why the Oracle connection reports ORA-12541 (TNS:no listener); done when the test passes without the elastic-agent.logs error.

Written by the indexing model from the issue text.