Configure Git size checks for KIDS distribution files

We use Scripts/ConvertToExternalData.py to avoid adding large .GBL,
.GBLs, .KID, .KIDs, .TXT, or .TXTs files to the source tree directly.
Stop telling our Git hooks not to check size limits for these file types
so that we do not accidentally add one over the limit.

Change-Id: I76231e6a86dd5a6964d1baf3f00b701724639069