enable -O3 opt level for active eth kernels

[SeanNijjar]

Ticket

#17423

Problem description

Active ethernet kernels are compiled with -Os. Fabric kernels can fit within the new binary size limit even with -O3 enabled.

What's changed

Enable -O3 for active ethernet kernels. For 1D fabric, this results in a throughput improvement of 800-1000 MB/s when sending 4KB sized packets.

Checklist

• All post commit CI: https://github.com/tenstorrent/tt-metal/actions/runs/13405235373
• T3K: https://github.com/tenstorrent/tt-metal/actions/runs/13415973303
• TG: https://github.com/tenstorrent/tt-metal/actions/runs/13405251335
• Blackhole Post commit CI passes (if applicable): https://github.com/tenstorrent/tt-metal/actions/runs/13405236857
• Model regression CI passes (if applicable)
• Device performance regression CI passes (if applicable)
• (For models and ops writers) Full new models tests CI passes (if applicable)
• New/Existing tests provide coverage for changes

[SeanNijjar]

pulling back to draft as some kernels exeeded kernel size limit so some additional work will be needed.