Falcon7b T3K/TG demo 47% prefill perf regression

[skhorasganiTT]

Falcon7b T3K/TG demo perf has regressed (for t3k seq 1024, prefill by ~47% and decode by ~5%). Verified locally that the failure started with a0ea595.

First T3K failing: https://github.com/tenstorrent/tt-metal/actions/runs/13444040365/job/37565282915
No t3k last passing, t3k demo pipelines have been hung for last couple weeks

Last TG passing: https://github.com/tenstorrent/tt-metal/actions/runs/13360145482/job/37308605343
First TG failing: https://github.com/tenstorrent/tt-metal/actions/runs/13402593833/job/37436533588

T3K seq 1024 Command: WH_ARCH_YAML=wormhole_b0_80_arch_eth_dispatch.yaml pytest --disable-warnings -q -s --input-method=json --input-path='models/demos/t3000/falcon7b/input_data_t3000.json' models/demos/t3000/falcon7b/demo_t3000.py -k "perf_mode_1024_stochastic_verify and 8"

T3K seq 1024 perf before a0ea595:

T3K seq 1024 perf with a0ea595:

cc @uaydonat @blozano-tt

[blozano-tt]

@TT-BrianLiu should we revert this commit to get closer to green?
cc: @ttmchiou