[Cloud Security] Add GCP rule templates

[orouz]

What does this PR do?

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• 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.

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• Start Time: 2023-08-15T10:55:21.341+0000

• Duration: 15 min 23 sec

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Passed	4
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Total	4

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚
Classes	100.0% (0/0)	💚
Methods	25.0% (2/8)	👎 -59.0
Lines	100.0% (0/0)	💚 12.766
Conditionals	100.0% (0/0)	💚

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Package cloud_security_posture - 1.5.0-preview34 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture

[elasticmachine]

Package cloud_security_posture - 1.5.0 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture