ResourceLoader: make cacheReport option false by default
In the three years or so that I have been around, we at Wikimedia have not to
my knowledge used the cache keys to manage the cache of ResourceLoader modules.
Instead, if we want to force a module to rebuild, we simply touch one of its
files. (Though even that is not often required these days.)
(cherry picked from commit 471a3bfb3d541ce73ca9e0fcfe540a17b9f4e2a5)