Restore test data files required by ICU performance tests

Performance tests strsrchperf and unisetperf in icu4c/source/test/perf/ look for several udhr_<lang> files as test data at the icu4j/perf-tests/data/udhr/.
Plus several other test data files expected by the performance tests have not been seen lately in the ICU repository:
thesis.txt
2drvb10.txt
ulyss10.txt
nvsbl10.txt
vfear11a.txt
xuzhimo.txt