chore: fix bench suite

[He-Pin]

tested with ./mill bench.runRegressions

[Copilot]

Pull request overview

Updates the benchmark suite to use the current sjsonnet importer API, fixing compilation/runtime wiring after the prior resolveImport-based approach became unavailable.

Changes:

• Replaced SjsonnetMainBase.resolveImport(...) calls with new SjsonnetMainBase.SimpleImporter(...) in benchmark/profiler entrypoints.
• Standardized importer construction to pass ordered jpaths plus allowedInputs = None.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
bench/src/sjsonnet/bench/RunProfiler.scala	Switches profiler runner to construct an importer via SimpleImporter directly.
bench/src/sjsonnet/bench/MaterializerBenchmark.scala	Updates benchmark interpreter setup to use SimpleImporter instead of resolveImport.
bench/src/sjsonnet/bench/MainBenchmark.scala	Updates main benchmark interpreter setup to use SimpleImporter instead of resolveImport.

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