Remove log that can be excessively noisy

[imjoehaines]

Goal

In RAM bundles there can be many sub-source maps, each of which result in a log message when the sourcesContent is present

Consola squishes these together for us (see source) but it's still quite noisy before we hit the threshold and we could be logging hundreds of messages if the user provides a custom logger

I opted not to add another log for when we are adding sourcesContent because there doesn't seem to be anything useful that's unique — the file path is shared between every sub-source map, so we would end up with the same problem if sourcesContent was missing