chore: add additional custom networks

[DanielSinclair]

Fixes BX-#### Figma link (if any):

What changed (plus any additional context for devs)

• added new network icons https://github.com/rainbow-me/assets/pull/91
• added new prepopulated custom networks
• filtering out testnets from network autofill when dev mode is disabled

Screen recordings / screenshots

What to test

[github-actions[bot]]

Here's the packed extension for this build: node_modules.tar.gz rainbowbx-fccf6cc0109cf2e57ce15311534336aa445e824f

[socket-security[bot]]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/viem@2.16.5	network	+7	16.5 MB	jmoxey

🚮 Removed packages: npm/viem@2.10.1

View full report↗︎

[github-actions[bot]]

Here's the packed extension for this build: node_modules.tar.gz rainbowbx-27ed40d122f2062827bf1e02b3b0687d189cddbd

[github-actions[bot]]

Here's the packed extension for this build: node_modules.tar.gz rainbowbx-27ed40d122f2062827bf1e02b3b0687d189cddbd

[github-actions[bot]]

Here's the packed extension for this build: node_modules.tar.gz rainbowbx-27ed40d122f2062827bf1e02b3b0687d189cddbd

[github-actions[bot]]

Here's the packed extension for this build: node_modules.tar.gz rainbowbx-e20ec7c28a0aeb67825d2f3d4d3626628bfe95ef

[github-actions[bot]]

Here's the packed extension for this build: node_modules.tar.gz rainbowbx-e20ec7c28a0aeb67825d2f3d4d3626628bfe95ef

[github-actions[bot]]

Here's the packed extension for this build: rainbowbx-e20ec7c28a0aeb67825d2f3d4d3626628bfe95ef

[DanielSinclair]

@BrodyHughes When you get a second to review; simple networks additions and now filtering testnets when dev mode is off

[github-actions[bot]]

Here's the packed extension for this build: rainbowbx-87f3fd77f781fdddc399cfd1e42eb4c77d6204c0