Better message for core.replace for big files
Better message for core.replace for big files

This change informs about the affected file that failed to be
replaced because it is too big. This message could be added to
other transformations, but core.replace is one of the most
common transforms.

BUG=230260855

Change-Id: I39dcf518f6a55d78e6043e15277f46ab8686f3b7

google/copybara,google/copybara,google/copybara