Sentry webpack plugin issues with sourcemaps and warnings

[AbhiPrasad]

@scott.cooper said:

We updated to the latest sentry webpack plugin and i've found that it is more annoying. It outputs this

[sentry-webpack-plugin] Warning: Didn't find any matching sources for debug ID upload. Please check the `sourcemaps.assets` option.

and it can output a bunch more stuff if you happen to have built the frontend before locally. Seems to always upload sourcemaps despite sourcemaps.disable always being true

[AbhiPrasad]

https://linear.app/getsentry/issue/BUNDLER-58 for more context