Update the k8s-service relation interface to v2 in kfp-metadata-writer

[DnPlas]

Context

Based on the proposal in canonical/mlops-libs#2 and the changes that are going to be introduced in canonical/mlmd-operator#71 we'll need to update the k8s-service relation interface handling in the ``kfp-metadata-writer` charm.

What needs to get done

Replace the SDI component that handles this relation interface with the library that is going to be created in canonical/mlops-libs#2

Definition of Done

1. The SDI implementation is replaced with the library proposed in Create k8s_service_info library that replaces the SDI k8s-service interface mlops-libs#2
2. There is a working upgrade path from a previous version of this charm

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5305.

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