bors f33379b0a6 Auto merge of #110811 - compiler-errors:vars-are-question-mark, r=WaffleLapkin
Use `?0` notation for ty/ct/int/float/region vars

Aligns the notation for infer vars that T-types and friends most often uses for inference variables with the notation in the compiler (which is kinda a sigil nightmare IMO: `_#`) by adopting `?0` style infer vars.

This mostly affects debug output since verbose infer vars shouldn't show up in user-facing places.

Does this need an MCP? It's debug output, so I'm thinking no, but happy to open one. 🤔

r? types
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