[Fleet] Support input variable for integrations package

[nchaulet]

Summary

Input variables used to not be available for integrations package, it seems the support for the UI editor is already done probably with #194310

That PR add the support so the package API, will support it too.

Test

I added unit test to cover that change,

You can test this with the elastic_conector package (in prerelease)

POST kbn:/api/fleet/package_policies
{
  "package": {
    "name": "elastic_connectors",
    "version": "0.0.4"
  },
  "name": "elastic_connectors-2",
  "namespace": "",
  "description": "",
  "policy_ids": [
    "fleet-server-policy"
  ],
  "vars": {},
  "inputs": {
    "github-connectors-py": {
      "enabled": true,
      "vars": {
        "connector_name": "my-test-connector",
        "connector_id": "123456"
      },
      "streams": {}
    },
    "google_drive-connectors-py": {
      "enabled": true,
      "vars": {
        "connector_name": "test",
        "connector_id": "tata"
      },
      "streams": {}
    }
  }
}

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[juliaElastic]

LGTM

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 6acecec

Failed CI Steps

• FTR Configs #103

Test Failures

• [job] [logs] FTR Configs #103 / Solution navigation smoke tests search solution sidenav & breadcrumbs renders the correct nav and navigate to links

Metrics [docs]

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
fleet	173.4KB	173.4KB	-4.0B

History

• 💛 Build #255721 was flaky 27baa23

cc @nchaulet

[kibanamachine]

Starting backport for target branches: 8.x

https://github.com/elastic/kibana/actions/runs/12120093534

[kibanamachine]

💚 All backports created successfully

Status	Branch	Result
✅	8.x

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