remove deprecated field conversions

[coszio]

For client Qdrant 1.8, we no longer need to support both deprecated and undeprecated fields, so this PRs removes these extra conversions.

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2. Have you installed pre-commit with pip3 install pre-commit and set up hooks with pre-commit install?

Changes to Core Features:

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• Have you written new tests for your core changes, as applicable?
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[generall]

LGTM on green CI