[Bugfix] Staged 2of4 example

[kylesayrs]

Purpose

• Fix staged 2of4 example

Background

• When [Callbacks] Remove pre_initialize_structure #1160 landed, this change introduced a bug in the recipe container which meant that the recipe was not recompiled after appending. This caused sgpt to initialize twice and gptq to never initialize, leading to a sparsity-only quantization config
• At some point, a changed was introduced which causes previous stages to become reconstructed after recipe recompilation. This means that without resetting the session in between stages, previous stages will initialize twice.
  • In order to avoid this issue, this PR introduces session.reset() in between stages
    • This change has the consequence of creating recipe.yaml files which do not have the full recipe history. However, I believe this is acceptable for the time being, as the stage runner and this work flow will be removed in the next release.

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[dsikka]

Just so I understand, we're removing the functionality to track past stages? Which I think landed not too long ago

[kylesayrs]

@dsikka That functionality breaks only for this example