Fix svg logos for empty pipeline template experiment

We need to fix SVG logos for the pipeline empty state experiment.

A few new issues were also brought up from !59465 (comment 552760372)

• Align all SVGs to have the same size. This is currently not the case because there were existing logos with a different size
• Fix template logo SVGs for dark-mode
• The docker logo has issues on firefox, which is likely due to the SVG optimizations