Tooling: Set default skeleton versions to 0.1.0-alpha

[tbradsha]

Our jetpack generate tooling sets 0.1.0-alpha as the initial SemVer version, but our project skeletons use 1.0.0-alpha. The CI will spot a mismatch unless this is bumped after creating a new project, e.g.:

https://github.com/Automattic/jetpack/actions/runs/12691002248/job/35373082324?pr=40923#step:4:462

Proposed changes:

This changes the skeleton versions to 0.1.0-alpha.

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Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

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