Update index mapping for CNVM findings

[uri-weisman]

What does this PR do?

Update CNVM index mapping

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.

Author's Checklist

• [ ]

How to test this PR locally

Run together with elastic/cloudbeat#912

Related issues

• Relates Move non-ECS fields from root level event cloudbeat#897
• Relates Update CNVM findings schema cloudbeat#912

Screenshots

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• Start Time: 2023-05-04T06:35:28.688+0000

• Duration: 14 min 4 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)	💚
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Methods	25.0% (2/8)	👎 -35.759
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Conditionals	100.0% (0/0)	💚

[kfirpeled]

@uri-weisman don't forget to make another pull request into main as well
You can keep that change in the changelog under 1.3.0 for the sake of keeping that list aligned

[elasticmachine]

Package cloud_security_posture - 1.3.0-preview8 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture

[elasticmachine]

Package cloud_security_posture - 1.3.0-preview9 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture

[elasticmachine]

Package cloud_security_posture - 1.3.0-preview10 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture

[elasticmachine]

Package cloud_security_posture - 1.3.0-preview91 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture

[elasticmachine]

Package cloud_security_posture - 1.3.0 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture

[elasticmachine]

Package cloud_security_posture - 1.3.1 containing this change is available at https://epr.elastic.co/search?package=cloud_security_posture