Fix bug where source transform passes untransformed model to next stage

[abhinaykukkadapu]

Summary: quantize_() modifies model in place, we need to make a copy to avoid making changes to user passed model. Fix a bug as discussed in #14171 (comment)

Differential Revision: D82167495

[pytorch-bot]

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D82167495

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D82167495

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This pull request was exported from Phabricator. Differential Revision: D82167495

[metascroy]

LGTM