[SECURITY_SOLUTION][ENDPOINT] Create artifact manifests with new relative URL (if fleet-server is enabled)

[paul-tavares]

Summary

1. When xpack.securitySolution.fleetServerEnabled is true, then Endpoint artifact manifest will use a fleet-server relative url for the artifacts generated (note: this flag is temporary until we ship v7.13)
2. Refactors the security solution fleet integration extension point callbacks so that some action handlers can be executed in parallel (the creation of detection engine prepackaged rules can sometime take some time to complete)

Example of Manifest Policy data when Fleet Server is enabled:

{
  "endpoint-exceptionlist-macos-v1": {
    "encryption_algorithm": "none",
    "decoded_sha256": "d801aa1fb7ddcc330a5e3173372ea6af4a3d08ec58074478e85aa5603e926658",
    "decoded_size": 14,
    "encoded_sha256": "f8e6afa1d5662f5b37f83337af774b5785b5b7f1daee08b7b00c2d6813874cda",
    "encoded_size": 22,
-   "relative_url": "/api/endpoint/artifacts/download/endpoint-exceptionlist-macos-v1/d801aa1fb7ddcc330a5e3173372ea6af4a3d08ec58074478e85aa5603e926658",
+   "relative_url": "/api/fleet/artifacts/endpoint-exceptionlist-macos-v1/d801aa1fb7ddcc330a5e3173372ea6af4a3d08ec58074478e85aa5603e926658",
    "compression_algorithm": "zlib"
  },
  //...
}

Checklist

• Unit or functional tests were updated or added to match the most common scenarios
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list

[elasticmachine]

Pinging @elastic/security-onboarding-and-lifecycle-mgt (Team:Onboarding and Lifecycle Mgt)

[paul-tavares]

this was both a rename (used to be called ingest_integration as well as a refactor. Prior version had all logic for the action that are taken in this module. Those have now been split up into separate modules (under ./handler/**)

[kevinlog]

are the handlers largely the same after the refactor?

[paul-tavares]

Yes - I just moved the code over. tests - which use the fleet_integration module - were unchanged.

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[jfsiii]

👍🏻 for the export { relativeDownloadUrlFromArtifact } from './services/artifacts/mappings'; changes in fleet

[nchaulet]

it would be nice to add this to the list of things to remove when we delete agents route (one day) #94303

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: e1b4c85
• Storybooks Preview

Metrics [docs]

✅ unchanged

History

• 💚 Build #112888 succeeded a3bae30

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

cc @paul-tavares

[paul-tavares]

Good point @nchaulet . I added a reference to this PR in the item already listed there