feat: add possibility to set extra labels and externalTrafficPolicy for service template

[cyril-s]

In some environments it's necessary to set externalTrafficPolicy: Local for a LoadBalancer service to preserve the client source IP (so network policies actually work). Also it's useful to add extra labels to a service, for example to select cilium LoadBalancer IP Pool

Deinition of Ready

• I am happy with the code
• Short description of the feature/issue is added in the pr description
• PR is linked to the corresponding user story
• Acceptance criteria are met
• All open todos and follow ups are defined in a new ticket and justified
• Deviations from the acceptance criteria and design are agreed with the PO and documented.
• No debug or dead code
• My code has no repetitions
• Documentation/examples are up-to-date
• All non-functional requirements are met
• If possible, the test configuration is adjusted so acceptance tests cover my changes

[eliobischof]

Thanks for this feature @cyril-s 🙏
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