[#302] Autoadd marks for frostfs

Signed-off-by: a.berezin <a.berezin@yadro.com>

src/frostfs_testlib/hooks.py

@@ -0,0 +1,12 @@
+import pytest
+
+
+@pytest.hookimpl
+def pytest_collection_modifyitems(items: list[pytest.Item]):
+    # All tests which reside in frostfs nodeid are granted with frostfs marker, excluding
+    # nodeid = full path of the test
+    # 1. plugins
+    # 2. testlib itself
+    for item in items:
+        if "frostfs" in item.nodeid and "plugin" not in item.nodeid and "testlib" not in item.nodeid:
+            item.add_marker("frostfs")