Allow customising the CI workflow name

Apologies if this is a duplicate - I couldn't find one.

Following the advice here: https://axodotdev.github.io/cargo-dist/book/ci/customizing.html#hand-editing-releaseyml

It would be useful if we can set a custom name for the release workflow, it is currently set to just a generic "Release", which may clash or be ambiguous with other workflows in the repository. For example we use release-plz and release-please workflows with distinctive names.

Start with the cargo-dist CI customization documentation, especially the hand-editing release.yml section linked in the issue, then inspect where the generated workflow name is defined. Make the release workflow name configurable instead of always using "Release", and verify that the generated workflow uses the selected name without affecting other workflows.

Written by the indexing model from the issue text.