selftests/bpf: Test the update operations for htab of maps

selftests/bpf: Test the update operations for htab of maps

Add test cases to verify the following four update operations on htab of
maps don't trigger lockdep warning:

(1) add then delete
(2) add, overwrite, then delete
(3) add, then lookup_and_delete
(4) add two elements, then lookup_and_delete_batch

Test cases are added for pre-allocated and non-preallocated htab of maps
respectively.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20241106063542.357743-4-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>