[CI] Add CI branch coverage calculation, fix statement coverage results and add log before test for buildkite log group (#1120)

Signed-off-by: wangyu31577 <wangyu31577@hundsun.com>
Co-authored-by: wangyu31577 <wangyu31577@hundsun.com>

pyproject.toml

@@ -155,11 +155,7 @@ python_classes = ["Test*"]
 python_functions = ["test_*"]
 addopts = [
     "--strict-markers",
-    "--strict-config",
-    "--cov=vllm_omni",
-    "--cov-report=term-missing",
-    "--cov-report=html",
-    "--cov-report=xml",
+    "--strict-config"
 ]
 markers = [
     # ci/cd required