Tests: Fix duplicate data set key in data_sanitize_key()

[Soean]

Description

Tests_Formatting_SanitizeKey::data_sanitize_key() declared two data sets with the same key 'a lowercase key with commas'. Since PHP keeps only the last value for a duplicate array key, the first case (howdy,admin) was silently discarded and never ran.

On top of that, the second case is mislabeled: its input is HOWDY,ADMIN, i.e. uppercase, not lowercase. Together with the following 'a mixed case key with commas' case, the clear intent is to cover lowercase / uppercase / mixed input.

This renames the second case to 'an uppercase key with commas', fixing both the duplicate key and the inaccurate label, and restoring the dropped lowercase case.

The duplicate key was introduced in [52292].

Testing instructions

Run the affected tests:
npm run test:php -- --filter Tests_Formatting_SanitizeKey tests/phpunit/tests/formatting/sanitizeKey.php

All cases pass, and the data provider now contributes the lowercase, uppercase, and mixed-case scenarios instead of dropping the lowercase one.

Trac ticket: https://core.trac.wordpress.org/ticket/64894

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

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[github-actions]

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