fix(plugins/gcp): update extract function

[lorenzo-merici]

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/kind bug

/kind cleanup

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/kind failing-test

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/area plugins

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What this PR does / why we need it:

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[poiana]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: lorenzo-merici
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[github-actions]

Rules files suggestions

gcp_auditlog_rules.yaml

Comparing 7164896980320f7138d29a5b13ae102df5e79d08 with latest tag gcpaudit-0.2.2

No changes detected

[jasondellaluce]

/close

Closing this one after discussing it with the contributor. The rationale is that we don't want to move from the current behavior of returning NULL when a field is missing. The correct semantics of Falco is to check whether a field exists or not with the exists operator in case it can return null.

[poiana]

@jasondellaluce: Closed this PR.

In response to this:

/close

Closing this one after discussing it with the contributor. The rationale is that we don't want to move from the current behavior of returning NULL when a field is missing. The correct semantics of Falco is to check whether a field exists or not with the exists operator in case it can return null.

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