ToolExecBase: Ignore exit value by default

It is up to implementations to call `ExecResult#assertNormalExitValue`
and/or `ExecResult#rethrowFailure` if the exit code of the process needs
to be validated.

Author: Jonathing

gradleutils-shared/src/main/java/net/minecraftforge/gradleutils/shared/ToolExecBase.java

@@ -158,6 +158,8 @@ protected ExecResult exec() {
         var stdOutLevel = this.getStandardOutputLogLevel().get();
         var stdErrLevel = this.getStandardErrorLogLevel().get();
         return this.getExecOperations().javaexec(spec -> {
+            spec.setIgnoreExitValue(true);
+
             spec.setClasspath(this.getClasspath());
             spec.getMainClass().set(this.getMainClass());
             spec.setExecutable(this.getJavaLauncher().get().getExecutablePath().getAsFile().getAbsolutePath());