Fix: restore image rendering in change/problem/task PDF descriptions

[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.
• This change requires a documentation update.

Description

• It fixes !44245
• Toolbox::stripTags() was stripping the content field before it reached the image-resolution logic in the PDF renderer, so embedded images displayed in Ticket PDF exports but not in Change/Problem descriptions or Problem task descriptions.
• This removes the stripping in those three places, aligning them with the pattern already used for Ticket, Followup and Solution PDF rendering.

Screenshots (if appropriate):