Add workflow to automate template customizations after copy

[andrewvaughan]

Description

Similar to:
https://github.com/JetBrains/intellij-platform-plugin-template/blob/deb171483598ee8a5d7621154db880e87b4db4ef/.github/workflows/template-cleanup.yml

I'm thinking there may be a way to do a good amount of the Template Checklist items in an initial workflow trigger immediately after the template is copied. This might include:

1. Performing most of the _TEMPLATE_CHECKLIST.md items, such as renamding URLs
2. Pruning all image-generation template files from the entire repo history (so the base repo isn't huge) such as the readme-banner.ai file
3. Automatically syncing labels from template-core instead of having to embed a configuration file
4. Creating the v0.1.0 milestone
5. (Maybe) setting up Kanban project for the new repo

It would also require making hard-references to some of the assets above, so the regex replace for the andrewvaughan/template-core URL modifier may need some more-advanced solutions.

Examples

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Priority

None

Additional context

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Code of Conduct

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