test: migrate math/base/special/fresnels to ULP-based testing

[ujjwalv01]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• Migrates the unit tests for math/base/special/fresnels (test.js and test.native.js) from relative tolerance testing to ULP difference testing 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

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

Implementation Note on ULP Tolerances:
When evaluating the 4 test loops against their corresponding C++ fixtures, the minimum required ULP tolerances were determined as follows per Instruction #4 of RFC #11352 ("Make sure that you put the minimum required ULP value possible"):

• small.json (small positive values): Set to 4 ULPs. Near zero, polynomial approximation rounding accumulates up to a 4 ULP gap from the reference fixture (at 1 ULP -> 25 fail; at 2 ULPs -> 8 fail; at 3 ULPs -> 2 fail; at 4 ULPs -> 0 fail).
• medium.json, large.json, and huge.json: Set to 1 ULP, achieving a 100% pass rate at the standard baseline tolerance.

These bounds represent the exact mathematical floor required to achieve a 100% pass rate (4,505 / 4,505 passing) across all test suites.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

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• Yes
• No

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• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/fresnels	$\\color{red}437/446$ $\\color{green}+97.98\\%$	$\\color{red}22/28$ $\\color{green}+78.57\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{red}437/446$ $\\color{green}+97.98\\%$

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

[kgryte]

LGTM