[CI][Benchmark] Add qwen2.5-7b test (#1104)

### What this PR does / why we need it?
- Add qwen2.5-7b performance benchmark, this is a sub pr of #1099, for
v1 test, need more verify
- Fix get commit time after checkout

---------

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

.github/workflows/nightly_benchmarks.yaml

@@ -170,10 +170,10 @@ jobs:
           while IFS= read -r line || [[ -n "$line" ]]; do
             commit_id=${line%% *}
             commit_title=${line#* }
-            commit_time=$(git show -s --format=%cd $commit_hash --date=iso-strict)
-            commit_time_no_tz=${commit_time::19}
 
             git checkout $commit_id
+            commit_time=$(git show -s --format=%cd $commit_hash --date=iso-strict)
+            commit_time_no_tz=${commit_time::19}
             pip install -e .
             
             echo "------------------------"