Snapshot 95 demo-tenant parsers (incl. stormshield) + un-ignore parsers/

The original upstream gitignores parsers/* on the assumption that each tenant
has its own set. This fork commits a working snapshot so the Parser Test Runner
and Parser Coverage features are usable out of the box.

Stormshield parser exercises the new SDL key=value scanner, pattern references,
and JS-style unquoted format keys added to backend/routers/quality.py.

parsers/ueba_test_merge

@@ -0,0 +1,13 @@
+{
+  "columnNames": ["entity_id", "feature_name", "value"],
+  "rows": [
+    [".anna.schmidt", "featureB3", 16],
+    [".lisa.bauer", "featureB3", 9],
+    [".thomas.weber", "featureB3", 18],
+    ["admin.klaus.fischer", "featureB3", 17],
+    ["billing.clerk.peter.wolf", "featureB3", 19],
+    ["lab.tech.sarah.koch", "featureB3", 9],
+    ["nurse.maria.m\\u00fcller", "featureB3", 16],
+    ["pharmacist.hans.meyer", "featureB3", 17]
+  ]
+}