[e2e] Signature redesign - Create metric tests

[digiwand]

ref: https://github.com/MetaMask/metamask-extension/issues/23552#issuecomment-2017496179

Create e2e tests:

• [ ] Metrics
  • [ ] check we are tracking the redesigned UI is being used (while we have both new and old co-existing). For this we can add the value redesigned_confirmation to the ui_customizations property of all signature events when the redesigned UI is being displayed
  • [ ] check we are tracking opening of account info modal

[jpuri]

Hey team! Please add your planning poker estimate with Zenhub @pedronfigueiredo @digiwand @seaona @pnarayanaswamy