bench: refactor to use string interpolation in ndarray/base/slice-dimension-to

[rohhann12]

Summary

• Replace string concatenation (pkg+'::...') with @stdlib/string/format for benchmark descriptions in ndarray/base/slice-dimension-to
• Add var format = require( '@stdlib/string/format' ); to the module requires
• Converts all 20 bench() calls to use format( '%s::...', pkg )

Motivation

Resolves the lint warnings from issue #10378 for this file. This follows the same pattern as recent commits (e.g., array/zeros-like, array/zero-to-like, array/zero-to).

Checklist

• No unnecessary formatting changes
• Only addresses the actual lint issue (string concatenation → format())

🤖 Generated with Claude Code

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