Clean up process globals

Summary: Cleaned up some `process` references

Reviewed By: passy

Differential Revision: D33184882

fbshipit-source-id: 6fc56bcea4e145ba97aa8bf9e689e53e2bf239cc

desktop/flipper-plugin/src/data-source/DataSourceRendererVirtual.tsx

@@ -349,5 +349,6 @@ export function useTableRedraw() {
 declare const process: any;
 
 function useInUnitTest(): boolean {
+  // N.B. Not reusing flipper-common here, since data-source is published as separate package
   return typeof process !== 'undefined' && process?.env?.NODE_ENV === 'test';
 }