fix: prevent PDF export crash on tables with nested quotes in inline styles

[Herafia]

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.
• This change requires a documentation update.

Description

• It fixes !45825
• The PDF export would crash on tickets whose descriptions contained an html table with styles using url(‘...’) (nested quotes). The regular expressions in cleanTableHtml would break the html at these quotes, corrupting the table structure and causing tcpdf to lose track of the cells.

Fix: Replaced the regular expressions with DOMDocument/DOMXPath parsing in cleanTableHtml, which is robust against nested quotes.