refactor(transformer/using): remove .into()

[overlookmotel]

Follow-on after #9310. Pure refactor. Replace .into() calls with more explicit Expression::from etc. This syntax is longer, but personally I find it clearer. When I see .into(), I always find myself wondering "but into what?".

[overlookmotel]

• perf(transformer/using): inline enter_statement #9680
• test(transformer/using): failing test for class name #9678
• refactor(transformer/using): rename vars #9677
• perf(transformer/using): avoid large types on stack #9676
• refactor(transformer/using): remove .into() #9675 👈 (View in Graphite)
• refactor(transformer/using): shorten AstBuilder calls #9674
• refactor(transformer/using): add more comments and amend some #9673
• refactor(transformer/using): re-order imports #9672
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #9675 will not alter performance

_{Comparing 03-11-refactor_transformer_using_remove_.into_ (076d872) with main (3ccb2fa)}

Summary

✅ 39 untouched benchmarks

[graphite-app]

Merge activity

• Mar 11, 6:08 AM EDT: A user added this pull request to the Graphite merge queue.
• Mar 11, 10:47 AM UTC: The Graphite merge queue couldn't merge this PR because it timed out.
• Mar 11, 8:02 AM EDT: A user added this pull request to the Graphite merge queue.
• Mar 11, 8:20 AM EDT: A user merged this pull request with the Graphite merge queue.