selftests/bpf: Test inner map identities in callbacks

Add load-only timer_mim coverage for inner map identities propagated
through nested timer and bpf_for_each_map_elem() callbacks.

The negative case initializes a timer in the second inner map with the map
saved from the first inner map timer callback. The positive case pairs the
timer value with the map supplied to the same for-each callback.

Without the verifier fix, the mismatched-map program is accepted while the
same-map control is rejected. Preserving map_uid reverses both verdicts.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904104203.345917-9-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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