[components][libc] run .init_array constructors in cplusplus_system_init

Newer GCC emits C++ global constructors into .init_array, which many
linker scripts keep outside [__ctors_start__, __ctors_end__), so they
never ran. Walk __init_array_start/__init_array_end (weak) as well,
skipping entries already covered by the ctors range.

Add RT_USING_CPP_CRT_INIT for ports whose startup runtime already runs
.init_array, default on for the simulator. With it set, only the
.init_array walk is skipped; the ctors range is still walked.

Renesas RA/RA_WIRELESS/RZ families select it when C++ is enabled: FSP
SystemInit() already walks .init_array, so boards whose linker script
only provides __init_array_* would run constructors twice. Boards that
fold .init_array into the ctors range (ra6m3-hmi-board, ra8d1, rz)
still run them once via RT-Thread.

Also source env.sh and restore RTT_EXEC_PATH in ToolsCI project generate
and dist steps so scons is on PATH (exit 127) and the ARM toolchain path
is not overwritten by env.sh.

Fixes #11778

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