Fix/45471/images display in pdf exports

[jdurand-teclib]

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 !45471
• Here is a brief description of what this PR does
  • Change images display in pdf to make them appear at their original place, instead of at the end of the document
  • Fix knowledge base's documents creation date not displaying in the table at the end
  • Fix some warning/error in the PHP logs

Screenshots (if appropriate):