Update service when labels and annotations are modified #2210
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Currently, if a user edits a resource and changes the labels and/or annotations of the service template, those changes don't get applied to the existing service.
This PR fixes the above problem and adds a few more unit tests to verify the behaviour. Additionally, any labels/annotations added manually (i.e. not through the service template) will be preserved as long as they don't conflict with the defaults or the service template.
Fixes #2175