[wp] remove memRegion testing

src/plugins/wp/tests/wp_region/README.md

src/plugins/wp/tests/wp_region/annot.i

src/plugins/wp/tests/wp_region/annot/a.i

src/plugins/wp/tests/wp_region/annot/b.i

src/plugins/wp/tests/wp_region/array1.i

src/plugins/wp/tests/wp_region/array2.i

src/plugins/wp/tests/wp_region/array3.i

src/plugins/wp/tests/wp_region/array4.i

src/plugins/wp/tests/wp_region/array5.i

src/plugins/wp/tests/wp_region/array6.i

src/plugins/wp/tests/wp_region/array7.i

src/plugins/wp/tests/wp_region/array8.i

src/plugins/wp/tests/wp_region/fb_ADD.i

src/plugins/wp/tests/wp_region/fb_SORT.i

src/plugins/wp/tests/wp_region/fc.sh

src/plugins/wp/tests/wp_region/garbled.i

src/plugins/wp/tests/wp_region/index.i

src/plugins/wp/tests/wp_region/matrix.i

src/plugins/wp/tests/wp_region/oracle/annot.res.oracle

src/plugins/wp/tests/wp_region/oracle/array1.0.dot