selftests/bpf: Avoid flaky resize value test for percpu data

The bpf_map__set_value_size() test for percpu data relies on the tail
'cpu_id' field in the ".percpu" map. The test would fail, when 'cpu_id' is
not the last field in the map.

To avoid the flaky test, factor out a subtest to use a dedicated
".percpu.arr" map that only has one field 'int arr[1]'. And, skip the
subtest when fail to load skel with errno E2BIG and the new value size is
larger than ALIGN(32KiB, PAGE_SIZE).

And, drop 'args' in test_percpu_data_on_cpus(), which isn't used in bpf
prog side.

And, enhance the test to cover 'set' and 'nums[6]'.

Fixes: 4c9241bd731a ("selftests/bpf: Add tests to verify global percpu data")
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20260826145613.34182-1-leon.hwang@linux.dev

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