create_package_version version_name default should be version number, not "Release"

[yippie]

Feature Type

I'm interested in functionality that solves a current problem or limitation in how CumulusCI works.

Does your feature request solve a current problem?

Yes, all of our releases have a very, very unhelpful name of "release"

Describe the solution you'd like

Change the default behavior of the version_name option to copy the version number instead of a hard coded "Release" as the string value

Describe alternatives you've considered

No response

Additional context

No response

[jlantz]

I have a working implementation of this feature using Jinja2 template expressions to dynamically generate the package version name for 1GP. I still need to write test coverage for it and docs then I'll submit it:
muselab-d2x#2