[Cloud Security] updates to move from doc_root.vulnerability.package -> doc_root.package (ECS)

[mitodrummer]

Summary

Issue: #157674

This updates all instances of vulnerability.package to the ECS standard package fieldset.

The new field has been populated by cloudbeat since 8.8

Checklist

Delete any items that are not applicable to this PR.

• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios

[elasticmachine]

Pinging @elastic/kibana-cloud-security-posture (Team:Cloud Security)

[opauloh]

Looks good

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 1c967b4

Failed CI Steps

• Serverless Security Investigations Cypress Tests #2
• Serverless Security Investigations Cypress Tests #3

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
cloudSecurityPosture	264.1KB	263.6KB	-502.0B

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[opauloh]

Hi, It is worth noting this is just a deprecation notice, so there’s no action needed by users as it’s a non-breaking change, our guidance is if there's any custom report or dashboard relying on vulnerability.package.* to be pointed to package.* as it will not be populated in future versions of Cloudbeat.