The provenance is not always properly reported

[lquerel]

The provenance information reported by Weaver is not always ideal. Below are a few examples that should be improved:

Instead of:

Provenance: https://github.com/open-telemetry/semantic-conventions/archive/refs/tags/v1.27.0.zip[model]/metrics/go-metrics.yaml

We should have:

Provenance: https://github.com/open-telemetry/semantic-conventions/archive/refs/tags/v1.27.0.zip[model/metrics/go-metrics.yaml]

Instead of:

  ⚠ The attribute `aws.dynamodb.table_names` in the group `registry.aws.dynamodb` contains an example that will be considered invalid in the future. All examples SHOULD be of type `string[]`.
  │ Provenance: "/Users/L.Querel/.weaver/semconv_registry_cache/repo.EcPezALMZfx2/registry/aws.yaml"

We should have:

  ⚠ The attribute `aws.dynamodb.table_names` in the group `registry.aws.dynamodb` contains an example that will be considered invalid in the future. All examples SHOULD be of type `string[]`.
  │ Provenance: https://github.com/open-telemetry/semantic-conventions/archive/refs/tags/v1.27.0.zip[model/registry/aws.yaml]

Implementation recommendation: In weaver_cache we should extend RegistryPath to add a method updating the current path with a relative path.