fix: fix the L0_infer tests for expected num tests

[richardhuo-nv]

What does the PR do?

Update the default expected num of tests in L0_infer. We overwrite this in the CI pipeline for each test set. But for external users, they will use the default value and encounter the test failure.

This is to reduce the confusion from qa team if they have no idea to set this env variable.

related issue:
https://nvbugspro.nvidia.com/bug/5250026
https://nvbugspro.nvidia.com/bug/5201464

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Background

https://nvbugspro.nvidia.com/bug/5250026
https://nvbugspro.nvidia.com/bug/5201464

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)