fix: corrected NeuralBandit, TensorBasedReplayBuffer and import path in test_serialization for code-coverage in CI/CD

[neuralsorcerer]

Change:

• Updated import path from from pearl.test.unit.with_pytorch.test_agent import TestAgentWithPyTorch to from test.unit.with_pytorch.test_agent import TestAgentWithPyTorch fixing code-coverage issue in CI/CD.
• Since test folder is outside pearl, it makes sense.

Why?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #123   +/-   ##
=======================================
  Coverage        ?   83.99%           
=======================================
  Files           ?      188           
  Lines           ?     9817           
  Branches        ?        0           
=======================================
  Hits            ?     8246           
  Misses          ?     1571           
  Partials        ?        0           

Flag	Coverage Δ
unittests	83.99% <100.00%> (?)

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[neuralsorcerer]

Latest change:

• Corrected NeuralBandit to reshape action-state features before model evaluation, ensuring values have the right dimensions.
• Adjusted action processing in TensorBasedReplayBuffer so scalar actions don’t create spurious extra dimensions.

Why?

fixed the above issue