Show output on RCE build:watch
Show output on RCE build:watch

It was previously a bit difficult to
see exactly what changes were being
made by babel --watch

flag=none

Test Plan:
Run build:watch in canvas-rce, make
a file chagne, and verify the name of
the updated file is printed in the
console

Change-Id: I29e9c7d93c660c8ca238d992bf81c22ef44635ce
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/278518
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Jon Scheiding <9af6aa5061dd5eef0e85122953253a66930fcf3e@instructure.com>
QA-Review: Jon Scheiding <9af6aa5061dd5eef0e85122953253a66930fcf3e@instructure.com>
Product-Review: Weston Dransfield <e9203059795dc94e28a8831c65eb7869e818825e@instructure.com>

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