Revert active-buffer-size-gb arg name.

[lmcafee-nvidia]

What does this PR do ?

Revert a recent name change. This PR switches --inference-dynamic-batching-active-buffer-size-gb back to --inference-dynamic-batching-buffer-size-gb. Now, the total buffer size additionally depends on the setting of --inference-dynamic-batching-unified-memory-level:

• uvm level 0: total buffer size == buffer_size_gb
• uvm level 1: total buffer size == 2 * buffer_size gb

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flowchart LR
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