Fix CI crosscompilation with rust >= 1.90

[j-chmielewski]

Our CI currently relies on cross for cross-compilation of foreign targets. With Rust 1.90 introducing a new linker, cross is no longer compatible and causes pipeline failures. As a temporary workaround, CI job was modified to use rust v1.89.

Since we now have Amazon workers set up, it makes more sense to drop cross-compilation altogether and instead use appropriate AWS machine architecture directly for builds.

Proposed change:
Update the CI configuration to stop using cross and build natively on the correct AWS workers.