BUG: Fix memory leak when slicing Series and assigning to self
This PR fixes a memory leak that occurs when a Series is sliced and reassigned to itself, e.g., a = a[-1:].

The underlying BlockManager retained references to the original data, preventing garbage collection. This is resolved by ensuring the sliced result copies the backing data.

Closes #60640.
Thanks for the PR, but this solution would be a non-starter as it introduces extra copies.

Since there's continuing discussion in the issue going to close this PR