fix: Updated selector for the test networks

[NidhiKJha]

This PR is to ensure that the permissions page renders list of all the permissions with the current networks. For a few networks, we don't have the rpcPrefs that was causing the siteKey nd the rpcPrefs to be undefined.
This PR also makes sure that the defined background color is there for the test networks that doesn't have a logo

Related issues

Fixes: #23812 #23793

Manual testing steps

1. Connect an account on Uniswap
2. Open the popup
3. Open the three-dot menu and choose "All Permissions"
4. It should render the permission with the accounts

Screenshots/Recordings

Before

Screen.Recording.2024-04-12.at.12.00.01.AM.mov

After

Screen.Recording.2024-04-11.at.11.58.43.PM.mov

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[darkwing]

Needs removal

[darkwing]

Can this be:

connectedNetwork.rpcPrefs??.imageUrl || ''

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.53%. Comparing base (b056a8b) to head (f050198).
Report is 60 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #23986      +/-   ##
===========================================
- Coverage    67.53%   67.53%   -0.00%     
===========================================
  Files         1245     1245              
  Lines        48848    48848              
  Branches     12743    12746       +3     
===========================================
- Hits         32989    32987       -2     
- Misses       15859    15861       +2     

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[metamaskbot]

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