Update in product illustrations with new dark/light compatible illustrations

Original design Jira ticket (internal): https://getsentry.atlassian.net/servicedesk/customer/portal/17/DTSD-67

We have new illustrations which work for both dark and light mode that need to be updated within the product.

Requirements

• SVGs should be optimized using SVGO (You may use svgomg as the web UI, it's very easy)
• SVGs should be sized properly so they do have have strange scaling issues in their usages

List of illustrations to replace

TODO: We'll need to generate the list of illustrations from the newly available ones here

NOTE: Some illustrations are animated, these should probably be delegated to other tasks, since they will require much more work to update (maybe)

Illustrations are here: https://brand.getsentry.com/d/4A7NQz1aXA1i/asset-library/collection/19