Tests: Move test_http_response_code_constants to getStatusHeaderDesc.php

[itzmekhokan]

Moves test_http_response_code_constants() from the HTTP API test file into the test class for get_status_header_desc(), so all tests for that function live in one place.

What the problem was:

• test_http_response_code_constants() exercises get_status_header_desc() but was located in tests/phpunit/tests/http/http.php (Tests_HTTP_HTTP).

What the fix does:

• Moves the test method into Tests_Functions_GetStatusHeaderDesc (tests/phpunit/tests/functions/getStatusHeaderDesc.php).
• Drops the redundant method-level @Covers ::get_status_header_desc, as the class-level docblock already declares it.

Approach and why:

• Test body is unchanged; this only relocates it to the canonical file for the function under test, improving discoverability and grouping.

Trac ticket: https://core.trac.wordpress.org/ticket/65527

Use of AI Tools

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Used for: Ticket analysis and tests. All changes were reviewed, validated against the codebase, and are taken responsibility for by me.

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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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