[CI] NEIGHBORS_MG_TEST flaky

Reported here https://github.com/NVIDIA/cuvs/pull/2584#issuecomment-5623785637

[ RUN      ] AnnMGTest/AnnMGTestF_float.AnnMG/8
terminate called after throwing an instance of 'raft::cuda_error'
  what():  CUDA error encountered at: file=/tmp/conda-bld-output/bld/rattler-build_libcuvs-headers/host_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_/include/raft/util/cudart_utils.hpp line=139 function=void raft::copy(Type*, const Type*, size_t, rmm::_RMM_26_12::cuda_stream_view) [with Type = long int; size_t = long unsigned int]: call='cudaMemcpyAsync(dst, src, len * sizeof(Type), cudaMemcpyDefault, stream.get())', Reason=cudaErrorMisalignedAddress:misaligned address
Obtained 16 stack frames
#1 in /opt/conda/envs/test/bin/gtests/libcuvs/../../../lib/libcuvs.so(+0x6707f6) [0x7dc83781f7f6]
#2 in /opt/conda/envs/test/bin/gtests/libcuvs/../../../lib/libcuvs.so(+0x1c6d413) [0x7dc838e1c413]
#3 in /opt/conda/envs/test/bin/gtests/libcuvs/../../../lib/libcuvs.so(+0x1c6d69f) [0x7dc838e1c69f]
#4 in /opt/conda/envs/test/bin/gtests/libcuvs/../../../lib/libgomp.so.1: GOMP_parallel +0x46 [0x7dc82717ef36]
#5 in /opt/conda/envs/test/bin/gtests/libcuvs/../../../lib/libcuvs.so(+0x1c755d6) [0x7dc838e245d6]
#6 in ./../../..//bin/gtests/libcuvs/NEIGHBORS_MG_TEST(+0x70796) [0x5eed6ff16796]
#7 in ./../../..//bin/gtests/libcuvs/NEIGHBORS_MG_TEST(+0x9752c) [0x5eed6ff3d52c]
#8 in ./../../..//bin/gtests/libcuvs/NEIGHBORS_MG_TEST(+0x97801) [0x5eed6ff3d801]
#9 in ./../../..//bin/gtests/libcuvs/NEIGHBORS_MG_TEST(+0x97ba7) [0x5eed6ff3dba7]
#10 in ./../../..//bin/gtests/libcuvs/NEIGHBORS_MG_TEST(+0x98026) [0x5eed6ff3e026]
#11 in ./../../..//bin/gtests/libcuvs/NEIGHBORS_MG_TEST(+0x9eac3) [0x5eed6ff44ac3]
#12 in ./../../..//bin/gtests/libcuvs/NEIGHBORS_MG_TEST(+0x9efb1) [0x5eed6ff44fb1]
#13 in ./../../..//bin/gtests/libcuvs/NEIGHBORS_MG_TEST(+0x2eddf) [0x5eed6fed4ddf]
#14 in /usr/lib/x86_64-linux-gnu/libc.so.6(+0x2a601) [0x7dc826b5e601]
#15 in /usr/lib/x86_64-linux-gnu/libc.so.6: __libc_start_main +0x88 [0x7dc826b5e718]
#16 in ./../../..//bin/gtests/libcuvs/NEIGHBORS_MG_TEST(+0x2eece) [0x5eed6fed4ece]

CMake Error at run_gpu_test.cmake:26 (execute_process):
  execute_process failed command indexes:

    1: "Abnormal exit with child return code: Subprocess aborted"
....
The following tests FAILED:
	 32 - NEIGHBORS_MG_TEST (Failed)
/__w/cuvs/cuvs

Start by reproducing NEIGHBORS_MG_TEST, especially AnnMGTest/AnnMG/8, using the failure output in the issue. Inspect run_gpu_test.cmake and the referenced stack trace to locate the misaligned CUDA copy. Done means the test no longer flakes or aborts with cudaErrorMisalignedAddress in CI.