[DEBUG] Just testing - #22840
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Disable the "Restrict USM residency to peers with enabled P2P access" feature by default: P2P access is now treated as enabled for all connectable peer devices out of the box, so USM allocations are made resident on all of them without requiring an explicit ext_oneapi_enable_peer_access() call. When the restriction is disabled, urUsmP2P(Enable|Disable)PeerAccessExp become no-ops that always return success, matching the behavior of the Level Zero V1 adapter. Add the SYCL_UR_L0_RESTRICT_USM_RESIDENCY_TO_P2P environment variable to opt back into the restrictive behavior on demand, requiring P2P access to be explicitly enabled for a peer before USM allocations become resident on it, and enforcing the enable/disable state machine. Update the tests that exercise this feature (sycl/test-e2e/USM/P2P/p2p_usm_residency.cpp and unified-runtime/test/adapters/level_zero/v2/memory_residency.cpp) to set the new environment variable so they keep testing the restrictive behavior. Document the new variable in EnvironmentVariables.md. Signed-off-by: Lukasz Dorau <lukasz.dorau@intel.com>
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