Closes#2766.
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## Motivation and Context
This PR upgrades the MSRV to 1.68.2.
## Checklist
- [x] I have updated `CHANGELOG.next.toml` if I made changes to the
smithy-rs codegen or runtime crates
- [x] I have updated `CHANGELOG.next.toml` if I made changes to the AWS
SDK, generated SDK code, or SDK runtime crates
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_By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice._
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Co-authored-by: Zelda Hessler <zhessler@amazon.com>
Co-authored-by: 82marbag <69267416+82marbag@users.noreply.github.com>
* Create workspaces for AWS SDK examples and tests and add CI step to verify them
* Centralize the Cargo target directory
* Remove the separate example workspace for now since it conflicts with the generated one
* Fix the rustfmt step
* Fix build path
* Fix mkdir in standalone tests
Ryan Schmitt