test: migrate stats/base/dists/erlang/pdf to ULP-based assertions

[Planeshifter]

Ref: #11352

Description

What is the purpose of this pull request?

This pull request:

• migrates test/test.native.js of @stdlib/stats/base/dists/erlang/pdf from computed EPS-based tolerances to ULP-based assertions using @stdlib/assert/is-almost-same-value, matching test/test.pdf.js and test/test.factory.js, which were already converted.
• uses a named ULP variable per test, tightened to the measured minimum that passes over the full fixture set: 271 (large k and lambda), 154 (large k), and 146 (large lambda). These were identical across two runs.

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.

The native addon was built locally to run test.native.js; 3021 assertions pass and eslint is clean.

Checklist

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• Read, understood, and followed the contributing guidelines.

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This PR was written primarily by Claude Code.

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https://claude.ai/code/session_01LjXCCBpdm51wAD4HxwLMCy

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/erlang/pdf	$\\color{green}290/290$ $\\color{green}+0.00\\%$	$\\color{green}11/11$ $\\color{green}+0.00\\%$	$\\color{green}3/3$ $\\color{green}+0.00\\%$	$\\color{green}290/290$ $\\color{green}+0.00\\%$

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

[kgryte]

LGTM after clean-up.