MV3 testcase for measuring the time it takes to load a newly created Account and Sending a tx

[seaona]

Explanation

We need a way to measure the delay caused by a service-worker re-start on common user actions along the application.
For that, this PR will take care of measuring common action times, on an MV3 test build, so we can compare with the MV2 reference.

Actions covered:

• how much time it takes for loading a newly created account (from Create Account button until balance is loaded
• how much time it takes from clicking Confirm tx until Tx is confirmed

Context:

• MV3 artifacts e2e measurement times #15305
• MV3 testcase for measuring the time it takes to load a newly created Account #15283