Enable JS source maps sending to sentry during build time.

[daltonfury42]

Ref #639 for an example, our sentry stack trace is not readable.

We need to do this: https://docs.sentry.io/product/sentry-basics/guides/integrate-frontend/upload-source-maps/

[maaverik]

I'll try spending some time to set this up. It will be helpful to diagnose issues that come up will all these new commits coming in.

[daltonfury42]

It will be very useful. I think this is a better read than the link above. In the doc, they point to a webpack plugin which might help us?