Add fake Source function and models

Author: egregius313

go/ql/test/library-tests/semmle/go/dataflow/flowsources/local/database/go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/rqlite/gorqlite v0.0.0-20250128004930-114c7828b55a
 	go.mongodb.org/mongo-driver v1.17.3
 	gorm.io/gorm v1.25.12
+	github.com/nonexistent/sources v0.0.0-20250300000000-000000000000
 )
 
 require (

go/ql/test/library-tests/semmle/go/dataflow/flowsources/local/database/source.ext.yml

@@ -3,4 +3,9 @@ extensions:
       pack: codeql/threat-models
       extensible: threatModelConfiguration
     data:
-      - ["database", true, 0]
+      - ["database", true, 0]
+  - addsTo:
+      pack: codeql/go-all
+      extensible: sourceModel
+    data:
+      - ["github.com/nonexistent/sources", "", False, "Source", "", "", "ReturnValue", "database", "manual"]

go/ql/test/library-tests/semmle/go/dataflow/flowsources/local/database/test.ext.yml

@@ -5,3 +5,9 @@ extensions:
       extensible: threatModelConfiguration
     data:
       - ["database", true, 0]
+
+  - addsTo:
+      pack: codeql/go-all
+      extensible: sourceModel
+    data:
+      - ["github.com/nonexistent/sources", "", False, "Source", "", "", "ReturnValue", "database", "manual"]

go/ql/test/library-tests/semmle/go/dataflow/flowsources/local/database/vendor/github.com/nonexistent/sources/stub.go

@@ -22,6 +22,9 @@ go.mongodb.org/mongo-driver/mongo
 # gorm.io/gorm v1.25.12
 ## explicit
 gorm.io/gorm
+# github.com/nonexistent/sources v0.0.0-20250300000000-000000000000
+## explicit
+github.com/nonexistent/sources
 # github.com/couchbase/gocbcore/v10 v10.5.4
 ## explicit
 github.com/couchbase/gocbcore/v10