Add check about permissions folder for tmp/service_logs

There has been some times, that the folder `.elastic-package/tmp/service_logs` is owned by a different user and tests could not write the required files in that folder.

That folder is used in tests through the placeholder `SERVICE_LOGS_DIR`.

It would be helpful to add a check to detect the permisisons and ownership of this folder. If that folder cannot be changed to the desired permissions, probably elastic-package should fail with an error about it.

Start by locating the handling of the SERVICE_LOGS_DIR placeholder and the tests that use .elastic-package/tmp/service_logs. Check how folder ownership and permissions are currently handled, then verify that an unusable folder produces a clear failure from elastic-package.

Written by the indexing model from the issue text.