rust: move `static_assert` into `build_assert`

Conceptually, `static_assert` is also a build-time assertion that occurs
earlier in the pipeline. Consolidate the implementation so that we can use
this as the canonical place to add more useful build-time assertions.

Reviewed-by: Yury Norov <ynorov@nvidia.com>
Signed-off-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patch.msgid.link/20260319121653.2975748-2-gary@kernel.org
[ Used kernel vertical style. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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