refactor(benchmarking): rebrand pallet → pezpallet in CLI and scripts

- Rename CLI argument --pallet to --pezpallet (with --pallet as alias)
- Rename --pallets to --pezpallet, --exclude-pallets to --exclude-pezpallets
- Update benchmark subcommand from 'pallet' to 'pezpallet'
- Rename check-frame-omni-bencher.yml to check-pezframe-omni-bencher.yml
- Update all benchmark scripts to use new argument names
- Update cmd.py to use pezframe-omni-bencher and --pezpallet

pezbridges/pezsnowbridge/scripts/benchmark.sh

@@ -5,9 +5,9 @@ pushd ../pezcumulus
 cargo run --release --bin pezkuwi-teyrchain \
 --features runtime-benchmarks \
 -- \
-benchmark pallet \
+benchmark pezpallet \
 --chain=bridge-hub-pezkuwichain-dev \
---pallet=snowbridge_pallet_ethereum_client \
+--pezpallet=snowbridge_pallet_ethereum_client \
 --extrinsic="*" \
 --execution=wasm --wasm-execution=compiled \
 --steps 50 --repeat 20 \