[fix] Fix failing netbox system tests

[Niceplace]

Proposed commit message

Fixes broken system tests for netbox integration for the devices and ips data streams by adding the required disable_keep_alive property into each test's config.

The disable_keep_alive key is required: https://github.com/elastic/integrations/blob/main/packages/netbox/manifest.yml#L84-L86 and ommiting it causes system tests to fail with errors

ERROR: could not add data stream config to policy: could not create package policy (req {"name":"netbox-devices-47415","description":"","namespace":"47415","policy_id":"62ee41fa-2eb1-417e-b19a-373e670b72a4","package":{"name":"netbox","version":"0.1.0"},"inputs":{"netbox-httpjson":{"enabled":true,"vars":{"enable_request_tracer":true,"token":"--token--","url":"http://svc-netbox_mock:8080"},"streams":{"netbox.devices":{"enabled":true,"vars":{"limit":2,"preserve_original_event":true}},"netbox.ips":{"enabled":false}}}},"force":false}); API status code = 400; response body = {"statusCode":400,"error":"Bad Request","message":"Package policy is invalid: inputs.httpjson.vars.disable_keep_alive: [\"Disable HTTP Keep-Alives is required\"]"}

How to test this PR locally

1. From the repo root cd packages/netbox
2. Start the stack elastic-package up -d
3. Run system tests elastic-package test system
4. Notice they all pass
5. Remove disable_keep_alive property from packages/netbox/data_stream/devices/_dev/test/system/test-default-config.yml and packages/netbox/data_stream/ips/_dev/test/system/test-default-config.yml
6. Run the system tests again elastic-package test system
7. Notice the tests fail with the error mentioned above

Related PRs experiencing the same falure

• Handle self-signed certs expiration in package tests #18881 (comment)
• [#17491][cisco-ftd]: Parse user authentication rejection reasons #18828 (comment)

[Niceplace]

Note: this PR will most likely have failing tests related to the aws.config integration which would be fixed by #18881, I'm keeping the two fixes separate for scoping reason but we could stack the PRs together if we want to.

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[Niceplace]

Duplicate of #18679, will close the current PR.