skipping invalid sized validation set

[shuvohishab]

Before submitting

• [ ] Was this discussed/approved via a Github issue? (no need for typos, doc improvements)
• [x] Did you read the contributor guideline?
• [x] Did you make sure to update the docs?
• [ ] Did you write any new necessary tests?

What does this PR do?

Fixes # (issue). Even though skip_invalid_size_inputs_valid_test was set to true, validation data samples with a length exceeding max_tokens are being taken. In fact, the entire validation data was taken into account, as opposed to skip the longer length samples. This PR will resolve the issue. It will choose just those samples whose length is shorter than the 'max_tokens' value.

PR review

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