Delete EndpointType.getEncoding, which is not needed anywhere.

If we need this down the line for model training, we can add it back in then.

java/ql/experimental/adaptivethreatmodeling/lib/experimental/adaptivethreatmodeling/EndpointTypes.qll

@@ -16,13 +16,6 @@ abstract class EndpointType extends string {
 
   final string getDescription() { result = this }
 
-  /**
-   * Gets the integer representation of this endpoint type. This integer representation specifies the class number
-   * used by the endpoint scoring model (the classifier) to represent this endpoint type. Class 0 is the negative
-   * class (non-sink). Each positive int corresponds to a single sink type.
-   */
-  abstract int getEncoding();
-
   /**
    * Gets the name of the sink/source kind for this endpoint type as used in Models as Data.
    *
@@ -47,8 +40,6 @@ abstract class SourceType extends EndpointType {
 class NegativeSinkType extends SinkType {
   NegativeSinkType() { this = "non-sink" }
 
-  override int getEncoding() { result = 0 }
-
   override string getKind() { result = "" }
 }
 
@@ -56,8 +47,6 @@ class NegativeSinkType extends SinkType {
 class SqlSinkType extends SinkType {
   SqlSinkType() { this = "sql injection sink" }
 
-  override int getEncoding() { result = 1 }
-
   override string getKind() { result = "sql" }
 }
 
@@ -65,8 +54,6 @@ class SqlSinkType extends SinkType {
 class TaintedPathSinkType extends SinkType {
   TaintedPathSinkType() { this = "path injection sink" }
 
-  override int getEncoding() { result = 2 }
-
   override string getKind() { result = "tainted-path" }
 }
 
@@ -74,8 +61,6 @@ class TaintedPathSinkType extends SinkType {
 class RequestForgerySinkType extends SinkType {
   RequestForgerySinkType() { this = "ssrf sink" }
 
-  override int getEncoding() { result = 3 }
-
   override string getKind() { result = "ssrf" }
 }
 
@@ -83,7 +68,5 @@ class RequestForgerySinkType extends SinkType {
 class OtherMaDSinkType extends SinkType {
   OtherMaDSinkType() { this = "other sink" }
 
-  override int getEncoding() { result = 4 }
-
   override string getKind() { result = "other-sink" }
 }