Java: Drive-by: fix oversight in #13823

In PR #13823, we had rewritten the endpoints that are being considered for framework mode. We used to use `DataFlow::ParameterNode` as endpoints.
However, `ParameterNode`s do not exist for the implicit `this` parameter; they also do not exist for bodiless interface-methods.

In PR #13823, we forgot to model that `this` only exists for non-static methods and to only consider parameters that we have source code for.

Author: Stephan Brandauer

java/ql/src/Telemetry/AutomodelFrameworkModeCharacteristics.qll

@@ -56,7 +56,7 @@ abstract class FrameworkModeEndpoint extends TFrameworkModeEndpoint {
 class ExplicitParameterEndpoint extends FrameworkModeEndpoint, TExplicitParameter {
   Parameter param;
 
-  ExplicitParameterEndpoint() { this = TExplicitParameter(param) }
+  ExplicitParameterEndpoint() { this = TExplicitParameter(param) and param.fromSource() }
 
   override int getIndex() { result = param.getPosition() }
 
@@ -70,7 +70,7 @@ class ExplicitParameterEndpoint extends FrameworkModeEndpoint, TExplicitParamete
 class QualifierEndpoint extends FrameworkModeEndpoint, TQualifier {
   Callable callable;
 
-  QualifierEndpoint() { this = TQualifier(callable) }
+  QualifierEndpoint() { this = TQualifier(callable) and not callable.isStatic() and callable.fromSource() }
 
   override int getIndex() { result = -1 }