feat: Updated Ux for Switching Via Dapp (Missing Network) - Custom Chain Id

[NidhiKJha]

This PR is to update the UI when the dapp tries to add custom Chain Id network in MetaMask

Related issues

Fixes: https://github.com/MetaMask/MetaMask-planning/issues/2661

Manual testing steps

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Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension 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.

[sonarqubecloud]

Quality Gate failed

Failed conditions
27.1% Duplication on New Code (required ≤ 7%)

See analysis details on SonarCloud