Allow omnibus to disable sourcemaps in memory constrained environments

Mike Greiling requested to merge fix-raspi-issues into master

Some memory-limited environments like Raspberry Pi cannot handle the webpack compile process. Allowing it to disable sourcemaps for certain builds has the effect of reducing the memory requirement by around 35-45%.

This has been tested with a hard-coded value and confirmed to fix our failing RasPi builds:

Related: #47656 (moved)

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