[GCP] Fix check on gcp.audit.authorization_info[].granted

[zmoog]

What does this PR do?

When gcp.audit.authorization_info[] objects do not contain the granted attribute, the if statement fails.

This PR updates the expression in the if to check for null values and uses the granted == true
syntax to avoid another error when there the == operator is not used.

The following error occurs with ... ctx?.gcp?.audit?.authorization_info[0]?.granted and granted is null.

Cannot invoke "Object.getClass()" because "value" is null

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.

How to test this PR locally

# walk into the GCP integration 
cd packages/gcp 

# start a stack version 8.6.2
elastic-package build && elastic-package stack up -d -v --version 8.6.2

# set up the environment variables 
eval $(elastic-package stack shellinit)

And then run the pipeline tests using the new data_stream/audit/_dev/test/pipeline/test-sdh-3695.log test case:

$ elastic-package test pipeline -v
2023/08/08 17:10:45 DEBUG Enable verbose logging
Run pipeline tests for the package
--- Test results for package: gcp - START ---
╭─────────┬────────────────────┬───────────┬────────────────────────┬────────┬──────────────╮
│ PACKAGE │ DATA STREAM        │ TEST TYPE │ TEST NAME              │ RESULT │ TIME ELAPSED │
├─────────┼────────────────────┼───────────┼────────────────────────┼────────┼──────────────┤
│ gcp     │ audit              │ pipeline  │ test-audit.log         │ PASS   │    12.5545ms │
│ gcp     │ audit              │ pipeline  │ test-sdh-3695.log      │ PASS   │   3.589584ms │
│ gcp     │ compute            │ pipeline  │ test-gcp-compute.json  │ PASS   │      2.933ms │
│ gcp     │ dns                │ pipeline  │ test-dns.log           │ PASS   │     11.807ms │
│ gcp     │ firewall           │ pipeline  │ test-firewall.log      │ PASS   │   9.665667ms │
│ gcp     │ loadbalancing_logs │ pipeline  │ test-load-balancer.log │ PASS   │   2.979667ms │
│ gcp     │ vpcflow            │ pipeline  │ test-vpcflow.log       │ PASS   │  65.097875ms │
╰─────────┴────────────────────┴───────────┴────────────────────────┴────────┴──────────────╯
--- Test results for package: gcp - END   ---
Done

Related issues

• Closes [GCP] Audit logs pipeline fail with: Error Message:Cannot invoke "java. lang. Number.intValue()" because the return v alue of "sun.invoke.util. ValueConversions.primitiveConversion (su n.invoke.util.Wrapper, Object, boolean)" is null #7307

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-08-08T15:23:03.590+0000

• Duration: 19 min 9 sec

Test stats 🧪

Test	Results
Failed	0
Passed	65
Skipped	0
Total	65

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (6/6)	💚
Files	100.0% (6/6)	💚
Classes	100.0% (6/6)	💚
Methods	87.826% (101/115)	👎 -12.174
Lines	96.0% (1464/1525)	👎 -0.621
Conditionals	100.0% (0/0)	💚

[kcreddy]

LGTM

[elasticmachine]

Package gcp - 2.25.1 containing this change is available at https://epr.elastic.co/search?package=gcp