test: migrate math/base/special/asecd to ULP-based assertions

[Planeshifter]

Summary

Migrates math/base/special/asecd test cases from relative-tolerance (EPS-scaled delta/tol) comparisons to ULP-difference assertions using @stdlib/assert/is-almost-same-value, per the guidance in #11352.

• test/test.js and test/test.native.js both updated. The idiom mirrors the already-converted sibling package math/base/special/asecdf (float32 variant) and math/base/special/cotd.
• Final ULP constant: ULP = 1 for both the negative-value and positive-value fixture blocks (used identically in both test.js and test.native.js).
• This was determined empirically: ULP = 0 fails (887 of 6009 assertions fail), ULP = 1 passes all 6009 assertions, confirmed deterministic across two consecutive runs.
• test/test.native.js mirrors the same ULP value as the JS tests; the native add-on could not be built/tested in this environment (tests skip via tryRequire), consistent with prior converted packages in this family.
• No other files were changed.

Resolves a part of #11352.

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Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/asecd	$\\color{green}188/188$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}188/188$ $\\color{green}+100.00\\%$

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

[kgryte]

The OP needs to be updated as described in the comments.