Refactor: rename `get_origin_or_inner_type` in `litestar.utils.typing` to a less confusing name

[vkcku]

Description

This is in relation to the discussion here.

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Litestar Version

2.2.0

Platform

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[Br1an67]

I'd like to work on this. Renamed get_origin_or_inner_type to unwrap_and_get_origin as discussed in #2463, with a deprecated alias for backward compatibility.

PR: #4618