selftests/bpf: Add more tests for loading insn arrays with offsets

A `gotox rX` instruction accepts only values of type PTR_TO_INSN.
The only way to create such a value is to load it from a map of
type insn_array:

   rX = *(rY + offset) # rY was read from an insn_array
   ...
   gotox rX

Add instruction-level and C-level selftests to validate loads
with nonzero offsets.

Signed-off-by: Anton Protopopov <a.s.protopopov@gmail.com>
Link: https://lore.kernel.org/r/20260406160141.36943-3-a.s.protopopov@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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