Revert "[lib] Migrate to Rust 2024"

[Breaking change] This is to test for failures
for core.vim3-vg-hwasan and will be reverted.

This reverts commit e88d40df2c311cb4698dd27e97be926111941676.

Reason for revert: Potential cause for core.vim3-vg-hwasan failure

Original change's description:
> [lib] Migrate to Rust 2024
>
> Bug: 461906397
> Change-Id: Ide55b0c5eb85bcaec4c0ba1d2ecce6d50e86cc37
> Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1438597
> Reviewed-by: James Robinson <[email protected]>
> Owners-Override: James Robinson <[email protected]>
> Commit-Queue: Sen Jiang <[email protected]>

Bug: 461906397
Change-Id: I38a33b72d1d53437d78da680f1984566af4b76f9
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1442337
Reviewed-by: RubberStamper 🤖 <[email protected]>
165 files changed