fix(redhat_osv): restructure test data (#308)

This commit restructures the test data so that CSAF and OSV data is not
co-mingled in the same directory. It is an attept to address

```
$ go install github.com/ossf/osv-schema/tools/osv-linter@latest
go: downloading github.com/ossf/osv-schema v1.6.7
go: github.com/ossf/osv-schema/tools/osv-linter@latest: create zip: tools/redhat/testdata/rhsa-2024_4546.json: case-insensitive file name collision: "tools/redhat/testdata/RHSA-2024_4546.json" and "tools/redhat/testdata/rhsa-2024_4546.json"
```

---------

Signed-off-by: Andrew Pollock <apollock@google.com>

tools/redhat/redhat_osv/convert_redhat_test.py

@@ -15,8 +15,8 @@ def test_convert_redhat(self):
             """ Test a single demo CSAF file """
             modified_time = datetime.strptime("2024-09-02T14:30:00",
                                               "%Y-%m-%dT%H:%M:%S")
-            csaf_file = f"testdata/rhsa-{test_advisory}.json"
-            expected_file = f"testdata/RHSA-{test_advisory}.json"
+            csaf_file = f"testdata/CSAF/rhsa-{test_advisory}.json"
+            expected_file = f"testdata/OSV/RHSA-{test_advisory}.json"
 
             with open(csaf_file, "r", encoding="utf-8") as fp:
                 csaf_data = fp.read()

tools/redhat/redhat_osv/osv_test.py

@@ -15,7 +15,7 @@ class ScoreTest(unittest.TestCase):
     def test_missing_cvss_v3(self):
         """Test parsing a CSAF file with missing CVSSv3 score"""
         for test_csaf_file in self.test_csaf_files:
-            csaf_file = f"testdata/{test_csaf_file}"
+            csaf_file = f"testdata/CSAF/{test_csaf_file}"
             with open(csaf_file, "r", encoding="utf-8") as fp:
                 csaf_data = fp.read()
             csaf = CSAF(csaf_data)
@@ -27,6 +27,7 @@ def test_missing_cvss_v3(self):
                     for remediation in vuln.remediations:
                         assert "@" in remediation.purl
 
+                # See https://github.com/ossf/osv-schema/pull/308#issuecomment-2456061864
                 osv = OSV(csaf, "test_date")
                 assert not hasattr(osv, "severity")
                 for affected in osv.affected: