fix: Fix wallet_addEthereumChain rpcUrls trailing slash cleanup

[jiexi]

Description

This PR improves the the wallet_addEthereumChain rpcUrls trailing slash cleanup

Related issues

fixes https://github.com/MetaMask/mobile-planning/issues/1589

Manual testing steps

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've clearly explained what problem this PR is solving and how it is solved.
• I've linked related issues
• I've included manual testing steps
• I've included screenshots/recordings if applicable
• 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.
• I’ve properly set the pull request status:
  • In case it's not yet "ready for review", I've set it to "draft".
  • In case it's "ready for review", I've changed it from "draft" to "non-draft".

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]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.24%. Comparing base (d47b4ab) to head (c3e16e9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8882   +/-   ##
=======================================
  Coverage   43.24%   43.24%           
=======================================
  Files        1271     1271           
  Lines       30913    30913           
  Branches     3090     3090           
=======================================
  Hits        13369    13369           
  Misses      16769    16769           
  Partials      775      775           

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[NicolasMassart]

Looks great 👍

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud