docs: Document Asset Manager image formats and SVG support in GrapesJS Builder

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Documents supported image formats in the GrapesJS Builder's Asset Manager, including the newly fixed SVG support from PR #15954.

Changes

builders/email_landing_page.rst

• Expanded Asset Manager section: Replaced the brief one-line description with comprehensive documentation
• New subsection: Supported image formats - Lists the image formats supported by the Asset Manager (PNG, JPG/JPEG, GIF, WebP, SVG, PDF)
• SVG compatibility note: Added a note explaining that most Email clients don't support SVG files, so they should be used for Landing Pages only
• New subsection: Uploading images - Documents the step-by-step workflow for uploading images in the Builder

Context

PR #15954 fixes a bug where SVG files uploaded through the GrapesJS Builder's image selector would upload successfully but not appear in the Asset Manager's image list. The root cause was that PHP's getimagesize() returns false for XML-based SVG files, causing them to be silently filtered out.

With this fix, users can now:

• Upload SVG files and see them in the image list
• Manage (view, delete) SVG files that were previously hidden in the UI
• Use SVG graphics in their Landing Pages

The documentation update proactively documents this capability while noting the important limitation that SVG files aren't supported by most Email clients.

Trigger Events

• mautic/mautic PR #15954: Enable svg files for image selector

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[promptless-for-oss]

SVG support fix in PR #15954 - FileManager.php now handles SVG files properly in the GrapesJS Builder's image selector.

Source: mautic/mautic#15954

[adiati98]

@promptless-for-oss please rebase to 7.2 branch.

[promptless-for-oss]

Thanks @adiati98! Rebased the branch onto 7.2 and the PR base is now retargeted to 7.2. The diff stays limited to the intended Asset Manager / SVG support documentation in docs/builders/email_landing_page.rst, and Vale passes clean. Ready for another look.