[FEATURE] Increase Test Coverage for ModelAccessControlHelper.java class

[dhrubo-os]

We need to improve test coverage in our repo.

This issue will target only to improve test coverage for ModelAccessControlHelper.java class

From this url we can see where test coverage is missing for this class: https://app.codecov.io/gh/opensearch-project/ml-commons/blob/2.x/plugin%2Fsrc%2Fmain%2Fjava%2Forg%2Fopensearch%2Fml%2Fhelper%2FModelAccessControlHelper.java

[th3ch3wy]

Hi I would like to work on this as my first issue

[dhrubo-os]

Sure, assigned to you.

[dhrubo-os]

@th3ch3wy any update on this issue?

[th3ch3wy]

@th3ch3wy any update on this issue?

Hi, so sorry I was not able to work on the issue recently, I was sick for a few weeks and catching up on school work, I am going to catch up and contribute as soon as possible