[ty] Remove duplicated docstring parsing test (#26893)
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## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
Despite its name, `test_numpy_style_with_different_indentation` was
identical to
[`test_numpy_style_parameter_documentation`](https://github.com/astral-sh/ruff/blob/16dca0f4b8c938ece1b0252d18c2142e6452c3ab/crates/ty_ide/src/docstring.rs#L1307-L1383).
## Test Plan
N/A
<!-- How was it tested? -->
