Context propagation for InstanceManager Status and Delete

Context propagation for InstanceManager Status and Delete

- enhance the Status and Delete methods of the InstanceManager
  interface to require the context paramater
- this is done to validate the approach and see if the handler
  and db related spans are then connected in one trace
- the other methods of the interface will follow once that works [0]

[0] this is also done because the diff of changes would become quite large
    if everything would be changed at once

Issue-ID: MULTICLOUD-1538
Change-Id: Ia1ec590f3326773e0df1e6cefba97711975bbf48
Signed-off-by: Fiete Ostkamp <fiete.ostkamp@telekom.de>