[MXNET-543] disable scalatest on Spark

[lanking520]

Description

This is aimed to fix this issue
@CodingCat @nswamy @yzhliu

Checklist

Essentials

Please feel free to remove inapplicable items for your PR.

• The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant JIRA issue created (except PRs with tiny changes)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage:
• Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
• Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore)
• Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL)
• Code is well-documented:
• For user-facing API changes, API doc string has been updated.
• For new C++ functions in header files, their functionalities and arguments are documented.
• For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable
• Check the API doc at http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html
• To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

[lanking520]

@CodingCat I will focus more on which test that breaks the CI and see if we can find an alternative rather than kill them all

[CodingCat]

when you disable the test, would you please only disable https://github.com/apache/incubator-mxnet/pull/10462/files#diff-b9835287795c57e48fb9da87d39d06a8R64 (LeNet) for now (I believe LeNet is much more memory-intensive ) and leave MLP to guard the correctness in Spark side,

if MLP also behaves flaky, let's go ahead and kill it (I think it will not)

[lanking520]

@CodingCat It also breaks scalatest on Mac, may not be only the memory issues

[CodingCat]

it happens consistently in mac?

[lanking520]

Please Don't merge at this time, still WIP
Finish fixing... have my hand crossed to pass the test

[anirudh2290]

No need to comment we can just remove, but not blocking it as this will have to go through another round of CI.