[wp] remove memRegion testing

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

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

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

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

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

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

src/plugins/wp/tests/wp_region/oracle/structarray1.0.dot

...plugins/wp/tests/wp_region/oracle/structarray1.res.oracle

src/plugins/wp/tests/wp_region/oracle/structarray2.0.dot

...plugins/wp/tests/wp_region/oracle/structarray2.res.oracle

src/plugins/wp/tests/wp_region/oracle/structarray3.0.dot

...plugins/wp/tests/wp_region/oracle/structarray3.res.oracle

src/plugins/wp/tests/wp_region/oracle/structarray4.0.dot

...plugins/wp/tests/wp_region/oracle/structarray4.res.oracle

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

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

...lugins/wp/tests/wp_region/oracle_qualif/array1.res.oracle

...lugins/wp/tests/wp_region/oracle_qualif/array2.res.oracle

...lugins/wp/tests/wp_region/oracle_qualif/array3.res.oracle

...lugins/wp/tests/wp_region/oracle_qualif/array4.res.oracle