[ GCP ] Fix convert processor in Audit Pipeline

[leandrojmp]

What does this PR do?

The Audit ingest pipeline has a convert processor that was breaking because the value of the field json.protoPayload.requestMetadata.callerIp is a string that was not being considered in the conditional.

This PR adds a new check in the conditional of the convert processor.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

• Closes GCP Audit Logs Integration v2.14.0 - Ingest Pipeline fails  #4589

[elasticmachine]

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• Start Time: 2023-03-20T23:34:19.972+0000

• Duration: 18 min 15 sec

Test stats 🧪

Test	Results
Failed	0
Passed	57
Skipped	0
Total	57

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[leandrojmp]

Hello @efd6 , can you add the correct labels in this PR? Thanks!

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[efd6]

/test

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (6/6)	💚
Files	100.0% (6/6)	💚
Classes	100.0% (6/6)	💚
Methods	90.291% (93/103)	👍 23.281
Lines	96.0% (1464/1525)	👎 -2.797
Conditionals	100.0% (0/0)	💚

[efd6]

Thanks

[elasticmachine]

Package gcp - 2.17.2 containing this change is available at https://epr.elastic.co/search?package=gcp