conformance: Fix path prefix for disable backend timeout route (#2947)

There is discrepancy between test request path (e.g. /disable-backend-timeout?delay=1s)
and path prefix in http route (e.g. /disabled-backend-timeout), which
will cause 404 response instead of 200.

Fixes: #2823

Signed-off-by: Tam Mach <[email protected]>

Author: sayboras

conformance/tests/httproute-timeout-backend-request.yaml

@@ -19,7 +19,7 @@ spec:
   - matches:
     - path:
         type: PathPrefix
-        value: /disabled-backend-timeout
+        value: /disable-backend-timeout
     backendRefs:
     - name: infra-backend-v1
       port: 8080