Refactoring GCP credentials -Fix continuation

[animehart]

On my previous PR (#7537) I forgot to include the changelog and manifest yml change
as such It didnt trigger the build to see my changes

[mitodrummer]

LGTM!

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• Start Time: 2023-08-25T21:46:25.699+0000

• Duration: 16 min 1 sec

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[elasticmachine]

Package cloud_security_posture - 1.5.2-preview2 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture

[oren-zohar]

@animehart was it tested with preview? Can we publish it in production?

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Package cloud_security_posture - 1.5.2 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture