Harmonize status bar msgs across the app -- and the toast msgs too

[couimet]

While watching automated: true tests run in extension host mode, I noticed inconsistencies where some status bar msgs feature a RangeLink: prefix and others do not.

Given the IDE's status bar is shared across all the extensions, we should always have our status bar msgs start with a RangeLink identifying value.

At the same time, we must ensure that the toasts do NOT start with a RangeLink prefix because the toast popup features as Source attribute that allows the user to know where a msg originates from.