[CI] Add pytest markers to current tests and update the doc. (#577)

Signed-off-by: Alicia <115451386+congw729@users.noreply.github.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>

pyproject.toml

@@ -175,6 +175,10 @@ markers = [
     "slow: Slow tests (may skip in quick CI)",
     "benchmark: Benchmark tests",
 ]
+filterwarnings = [
+    "ignore:.*does not have '__test__' attribute.*:UserWarning",
+    "ignore:.*does not have '__bases__' attribute.*:UserWarning",
+]
 
 [tool.typos.default]
 extend-ignore-identifiers-re = [