fix: sort generator imports in templates with CRLF line endings

[paulbalandan]

Description
GeneratorTrait::buildContent() finds the import block with /(?:^use [^;]+;$\n?)+/m. In multiline mode $ only matches before \n, so on a template with CRLF line endings the \r after each ; breaks the match and the imports are left unsorted. This hits custom generator views set in Config\Generators::$views and saved with CRLF, for example on Windows.

The pattern now allows \r? before the line end. The imports are split on normalized \n and rejoined with the template's own line ending, so CRLF output stays CRLF.

The publish:language test fixture gains a --crlf flag that converts its template to CRLF, and ConfigurableSortImportsTest covers the sorted CRLF output. A follow-up PR on 4.8 applies the same fix to AbstractGeneratorCommand.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide