Add @DisableCachingByDefault as hint why outputs are not cached

[skuzzle]

The @DisableCachingByDefault annotation (JavaDoc) will make it easier to determine why this task was not cached when inspecting a Build Scan.

Without this annotation, a gradle Build Scan will only show a generic message:

With the annotation, the Build Scan will show a more useful hint as to why this task was not cached:

[nedtwigg]

Thanks!

[nedtwigg]

If you disagree with the changes I made above, please let me know.