Add ERROR_COMMITTER and ERROR_AUTHOR codes

Also includes a PROXY_PUSH code for the meantime as we are still capturing that as a requirement for the moment. The mentioned 2 codes above are needed to differentiate error and committer access errors

src/main/java/org/eclipsefoundation/git/eca/namespace/APIStatusCode.java

@@ -13,7 +13,7 @@ import com.fasterxml.jackson.annotation.JsonValue;
public enum APIStatusCode {
SUCCESS_DEFAULT(200), SUCCESS_COMMITTER(201), SUCCESS_CONTRIBUTOR(202), ERROR_DEFAULT(-401), ERROR_SIGN_OFF(-402),
-	ERROR_SPEC_PROJECT(-403);
+	ERROR_SPEC_PROJECT(-403), ERROR_AUTHOR(-404), ERROR_COMMITTER(-405), ERROR_PROXY_PUSH(-406);
private int code;