[DEV] update release workflow layer name

[8naama]

• Align the release layer name to match the layer name we provide in the release description
• Ensure the layer version is updated consistently
  • This change assumes that all layers versions in all regions are the same.
  • The reason for this, is that the current setup uses a general layer-publish.yaml workflow for all layers. This workflow is where we get the new layer version. However, the text in the release notes is only updated for the collector layer.
  • So in order to pass the layer version from layer-publish.yaml workflow >> release-layer-collector.yaml workflow, we generate a single artifact with one of the versions, this is the version we update at the release description.

Future considerations:
In the future, if additional regions are added, we should change this workaround to a more stable solution.
Perhaps generating a text that works for any layer and potentially include a table with the relevant ARN per region, similar to other solutions we have.

[bardabun]