bench: refactor to use string interpolation in @stdlib/stats/base/dists/discrete-uniform/logpmf

[rautelaKamal]

Description

This PR refactors the benchmark files to use string interpolation for benchmark names and corrects the variable sorting order in the main loop to follow the convention len, max, min, i, y.

Checklist

• I have read the CONTRIBUTING.md document.
• I have followed the prevailing coding style.
• I have confirmed that the changes are correct.

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