fix: Wallet not switching networks when add new network requested by a dapp

[tommasini]

Description

The wallet was not switching networks after adding a new network added by a dapp.

It was a promise not resolved

Related issues

Fixes: #

Manual testing steps

Dapp where it is easy to reproduce: https://chris-react-dapp.vercel.app/

1. Connect to dapp via QR Code or deeplink
2. Tap "Add Polygon chain"
3. Accept adding the Polygon chain
4. Accept the switch to Polygon
5. The chain dropdown is not updated

Screenshots/Recordings

Before

In the issue description: https://github.com/MetaMask/mobile-planning/issues/1346

After

https://recordit.co/lDMTEaaKq1

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]

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.

[github-actions]

E2E test started on Bitrise: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/04167bf4-be88-47eb-9973-1d0387750a72
You can also kick off another Bitrise E2E smoke test by removing and re-applying the (Run Smoke E2E) label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c312ee8) 34.95% compared to head (4417da5) 34.95%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7667   +/-   ##
=======================================
  Coverage   34.95%   34.95%           
=======================================
  Files        1030     1030           
  Lines       27363    27363           
  Branches     2253     2253           
=======================================
  Hits         9564     9564           
  Misses      17289    17289           
  Partials      510      510           

Files	Coverage Δ
app/core/RPCMethods/wallet_addEthereumChain.js	80.00% <100.00%> (ø)

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[frankvonhoven]

LGTM

[siosio34]

LGTM

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[tommasini]

new E2E build : https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/1a7bbd23-197b-4fed-8e48-acccd5a2e5d6