Fix name collision on inlined mapping

[faddiv]

Fix name collision on inlined mapping

Description

This PR ensures that the inlined mapping in the projections doesn't cause parameter collision.

Fixes #2012

Checklist

• [x] The existing code style is followed
• [x] The commit message follows our guidelines
• [x] Performed a self-review of my code
• [ ] Hard-to-understand areas of my code are commented
• [ ] The documentation is updated (as applicable)
• [x] Unit tests are added/updated
• [ ] Integration tests are added/updated (as applicable, especially if feature/bug depends on roslyn or framework version in use)

[latonz]

Mapperly usally works top to bottom. Here, the approach is inversed (the parameter names are reserved from the innermost mapping). I'd prefer doing it the other way around (that's what I tried): rewriting the inlined mapping with unique parameter names. That's actually also what we do for the source parameter.

[latonz]

Feel free to reopen with a rewrite parameters approach 😊 Closing for now as no update was provided for a couple of weeks.