#16415: fix moreh_adam

[hschoi4448]

Ticket

#16415

Problem description

I recently ran test_moreh_adam.py and discovered that the test is failing. The reason it hasn't been detected until now is because the failure is due to TT_ASSERT, which hasn't been caught by GitHub Actions so far.

What's changed

1. fix test_moreh_adam.py

• I fixed an issue where an unnecessary output tensor was being passed as an input when amsgrad is set to false.

2. fix moreh_adam create_output_tensors

• I corrected a missing nullopt that should have been included to maintain a consistent number of outputs.

3. fix override_runtime_arguments

• I fixed an issue where an optional tensor was accessed without checking whether it contained a value, which caused an error.

Checklist

• Post commit CI passes https://github.com/tenstorrent/tt-metal/actions/runs/12624347495
• Blackhole Post commit (if applicable) https://github.com/tenstorrent/tt-metal/actions/runs/12663067564
• Model regression CI testing passes (if applicable)
• Device performance regression CI testing passes (if applicable)
• (For models and ops writers) Full new models tests passes
• New/Existing tests provide coverage for changes

[hschoi4448]

Currently, checklist is not check. But I will run all the tests before merge.