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

[ujjwalv01]

Resolves a part of #11352

Description

What is the purpose of this pull request?

This pull request migrates the tests for @stdlib/math/base/special/xlogy from relative tolerance testing to ULP difference testing.

Specifically:

• Removed EPS and abs imports
• Added @stdlib/assert/is-almost-same-value
• Replaced relative tolerance testing logic with isAlmostSameValue( out, expected[i], 2 )
• Removed unused delta and tol variables

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

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No.

Checklist

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

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

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