Fix: formatted text rendered as visible HTML tags in PDF exports

[Rom1-B]

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
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Description

• It fixes !43955

GLPI-encoded content (<p>) was concatenated with the HTML label before getEnhancedHtml() processing in displayText(). The mixed string caused Sanitizer::isHtmlEncoded() to return false (literal <> in the label), skipping entity decoding. TCPDF then rendered <p> as visible text characters <p> instead of HTML paragraph tags, producing HTML fragments in the PDF and all text as a single unformatted block.

Fix: process $content separately through getEnhancedHtml() before concatenating with the label. Also strips residual <script> tags to prevent JavaScript code (e.g., from GLPI's "read more" wrapper) from appearing as visible text in the PDF.

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