Refactor TEXTAREA tests to use data provider pattern

[Copilot]

Consolidates three nearly-identical TEXTAREA test methods into a single parameterized test using a data provider, following the existing pattern used for PRE and LISTING tests in the same file.

Changes

• Combined test_modifiable_text_special_textarea(), test_modifiable_text_special_textarea_carriage_return(), and test_modifiable_text_special_textarea_carriage_return_newline() into one test method
• Added data_modifiable_text_special_textarea() provider with test cases for \n, \r, and \r\n leading characters
• Test method now accepts parameterized inputs: $set_text, $expected_text, $expected_html
• Reduces ~67 lines to ~54 lines while maintaining identical test coverage

Trac ticket: https://core.trac.wordpress.org/ticket/64609

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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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