add constraint graph to polonius MIR dump #136278
                
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Another easy one while I work on diagnostics. This PR adds a mermaid visualization of the polonius constraint graph to the polonius MIR dump.
Adding kills is left to a future PR (until they're encoded in edges directly or I set up recording debugging info in and out of the analysis), because right now they're only computed during traversal.
Here's how that looks.
r? @matthewjasper but as always feel free to reroll.