tst_QtJson: make invalidBinaryData() data-driven

This helps to see which file produces which errors, if any.

Also add a filter on *.bjson, so any garbage doesn't appear in the
data tags, sort by name to ensure stable data tag order, and filter on
Files to not have to do it manually at the QFileInfo level. With that,
we can also just use entryList() instead of entryInfoList().

Test-only, so picking to all branches, incl. ESM ones, as a help for
ourselves. There is no need to ship this.

Pick-to: 6.12 6.11 6.8 6.5 5.15
Change-Id: I43647f1f839031e23c4db3f7a2a11c7417e080d0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>