fix: Aurora RPC deprecation message

[bergeron]

Description

Fixes the Aurora deprecation message. It was suggesting MM no longer supports Aurora, which is not true. It's just no longer a built-in network due to Infura no longer supporting it.

Instead, we show a warning to users who previous added it when it was a built-in network. And give them a 1 click migration from Infura to the mainnet.aurora.dev RPC endpoint.

Related issues

Fixes: #23078

Manual testing steps

1. Add the Aurora network via https://chainid.network
2. Verify no deprecation warnings

The RPC migration modal is harder to test. You'd need to have added the network on MM <= 11.6 back when the Infura RPC url was alive.

Screenshots/Recordings

Before

After

Simulating a user who previously added the Infura RPC:

Screen.Recording.2024-05-14.at.9.30.38.PM.mov

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[salimtb]

linter and unit tests should be fixed as well

[Karkunow]

@bergeron, Hello, Brian! Thank you for working on this!
Just wanted to ask about the ETA of this task - do you have any timeline for its release? Thank you!

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 65.77%. Comparing base (82fe51c) to head (e097149).
Report is 2 commits behind head on develop.

Files	Patch %	Lines
...ents/ui/deprecated-networks/deprecated-networks.js	59.09%	9 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #24534   +/-   ##
========================================
  Coverage    65.77%   65.77%           
========================================
  Files         1366     1366           
  Lines        54238    54236    -2     
  Branches     14108    14110    +2     
========================================
  Hits         35670    35670           
+ Misses       18568    18566    -2     

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