An unused piece of stock accounting code left behind after an earlier cleanup has been removed. This keeps the system codebase simpler and easier to maintain, with no expected impact on daily operations.

- After a recent [refactor] in 19.0, all occurrences of the `_get_valued_types` function were removed, but the function itself got left out.

- Hence it can be safely removed, without any problems.

- This commit removes the dead code.

[refactor]: https://github.com/odoo/odoo/pull/222169

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This change removes remaining unused code from the Product Barcode Lookup module that should have been removed in an earlier update. It helps keep the system cleaner and reduces the chance of obsolete background logic affecting future maintenance.

Forgot to remove the code in master for https://github.com/odoo/enterprise/pull/97780 .