[e2e] Rework templates' publishing

[eromanova]

Currently, all templates for E2E testing are stored in the repository oci://ghcr.io/k0rdent/kcm/charts-ci. Before publishing these templates, we update the kcm and kcm-templates versions to the latest commit-based version (e.g., 0.1.0-30-g67f3282), while other templates retain the versions defined in their Chart.yaml files.

This introduces several issues:

1. If a template with the same version already exists in the repository, it will not be updated, leading to the deployment and testing of an outdated version.
2. When multiple PRs modify templates simultaneously, there is no guarantee that the correct version will be tested, causing inconsistencies in the validation process.