update test_random.py and test_random_state.py

[vtavana]

In this PR, test_random.py and test_random_state.py are updated.

In addition, the functions in dpnp/tests/helper.py are re-organized in alphabetic order.

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• If this PR is a work in progress, are you filing the PR as a draft?

[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/index.html

[github-actions]

Array API standard conformance tests for dpnp=0.18.0dev0=py312he4f9c94_14 ran successfully.
Passed: 1006
Failed: 0
Skipped: 16

[coveralls]

coverage: 71.883%. remained the same
when pulling 0075894 on update-random-tests
into 456e55c on master.

[antonwolfy]

Thank you @vtavana