fix(detectors): TypeError (#95356)

Fixes `TypeError: 'NoneType' object is not subscriptable` in
`SQLInjectionDetector`.

This error occurred when `extract_request_data` encountered `None` or
malformed entries in the request query parameters or body, leading to a
crash when attempting to access `query_pair[1]`.

The fix adds a defensive check to skip `None` or insufficiently sized
`query_pair` entries, making the detector more robust against unexpected
input data.


[SENTRY-FOR-SENTRY-5ZQH](https://sentry.my.sentry.io/organizations/sentry/issues/2313274/)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: armenzg

src/sentry/performance_issues/detectors/sql_injection_detector.py

@@ -91,6 +91,9 @@ def extract_request_data(self, event: dict[str, Any]) -> None:
             request_data.extend(self.request_body.items())
 
         for query_pair in request_data:
+            # Skip None values or pairs that don't have at least 2 elements
+            if not query_pair or len(query_pair) < 2:
+                continue
             query_value = query_pair[1]
             query_key = query_pair[0]