[BUG] Compile failure with new MLTask Constructor

[dbwiddis]

What is the bug?

opensearch-project/ml-commons#2825 added a new parameter to the constructor. We use that in a test:

src/test/java/org/opensearch/flowframework/workflow/RegisterLocalPretrainedModelStepTests.java:140: error: no suitable constructor found for MLTask(String,String,,,MLTaskState,,,,,,,,,boolean)

How can one reproduce the bug?

Attempt to compile the code with current upstream dependencies.

Specifically:

./gradlew compileTestJava

(If it passes, you probably have cached dependencies.)

What is the expected behavior?

Code compiles.

What is your host/environment?

Multiple environments failed in #856 but you can probably reproduce it anywhere.

Do you have any additional context?

The constructor is annotated @Builder so we should change that line of code to use a builder (omitting the nulls) to be robust to future changes.

This needs to be fixed promptly and backported to 2.17.