test: migrate stats/base/dists/triangular/skewness to ULP-based assertions

[Devansh-18155]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• Migrates unit tests for @stdlib/stats/base/dists/triangular/skewness from relative tolerance checks (delta <= tol) to ULP-based assertions using @stdlib/assert/is-almost-same-value.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352

Questions

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No.

Other

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No.

Checklist

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/triangular/skewness	$\\color{green}210/210$ $\\color{green}+100.00\\%$	$\\color{green}11/11$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}210/210$ $\\color{green}+100.00\\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

LGTM