[CI] Remove benchmark patch and increase the scheduler frequency (#1762)

### What this PR does / why we need it?
This pr purpose to do the following things:
1. Remove `benchmark_datasets.py` patch
2. Increase the scheduler frequency to 2 times per day, due to the
recent large number of daily submissions, we need to increase the
default test time(6h)
### Does this PR introduce _any_ user-facing change?

### How was this patch tested?


- vLLM version: v0.9.2
- vLLM main:
247102f07f

---------

Signed-off-by: wangli <wangli858794774@gmail.com>

benchmarks/scripts/run-performance-benchmarks.sh

@@ -281,7 +281,6 @@ cleanup_on_error() {
 main() {
   START_TIME=$(date +%s)
   check_npus
-  python3 benchmarks/scripts/patch_benchmark_dataset.py
   
   # dependencies
   (which wget && which curl) || (apt-get update && apt-get install -y wget curl)