[Cashtab] Upgrade react-ga implementation

Summary:
The current implementation is based off legacy react (componentDidMount etc) and also uses legacy routing. Will not work with react-router-dom v6.

Simplify and use latest version of react-ga.

Test Plan:
Check dev console at https://cashtab-local-dev.netlify.app/#/wallet

I've added logging statements to this deployment

Confirm you see GA initialized on load and logging... as routes change.

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D15408