flush logs on cmd failure (#1338)

## Description

The secondary scripts in corso (factory, purge, etc) are not currently flushing their logs if an error occurrs since os.Exit(1) kills the current process without alloting time for deferred funcs to run.

## Type of change

- [x] 🐛 Bugfix

## Issue(s)

* #902

## Test Plan

- [x] 💚 E2E

src/cmd/factory/factory.go

@@ -79,6 +79,7 @@ func main() {
 	addOneDriveCommands(oneDriveCmd)
 
 	if err := factoryCmd.ExecuteContext(ctx); err != nil {
+		logger.Flush(ctx)
 		os.Exit(1)
 	}
 }

src/cmd/getM365/getItem.go

@@ -63,6 +63,7 @@ func main() {
 	cobra.CheckErr(getCmd.MarkPersistentFlagRequired("category"))
 
 	if err := getCmd.ExecuteContext(ctx); err != nil {
+		logger.Flush(ctx)
 		os.Exit(1)
 	}
 }

src/cmd/purge/purge.go

@@ -88,6 +88,7 @@ func main() {
 	purgeCmd.AddCommand(oneDriveCmd)
 
 	if err := purgeCmd.ExecuteContext(ctx); err != nil {
+		logger.Flush(ctx)
 		os.Exit(1)
 	}
 }