[Feature Request] Create integration test for testing snapshot restore on CPUs with different TSC frequencies.

# Feature Request

Create integration test for testing snapshot restore on CPUs with different TSC frequencies.

## Describe the desired solution

Create a integration test to validate this code: https://github.com/firecracker-microvm/firecracker/blob/f2f8802122cf20fa043600290dcc938c96b9611d/src/vmm/src/builder.rs#L482

## Describe possible alternatives

We need 2 things for this:
* a snapshot saved on S3 on a CPU that has a certain TSC frequency
* an integration test that is being run on a CPU with a different frequency

`[Author TODO: How do you work around not having this feature?]`

## Additional context

`[Author TODO: Add additional context about this feature request here.]`

## Checks

- [x] Have you searched the Firecracker Issues database for similar requests?
- [x] Have you read all the existing relevant Firecracker documentation?
- [x] Have you read and understood Firecracker's core tenets?

Start in src/vmm/src/builder.rs around the linked snapshot-restore code, then inspect the existing integration-test setup and snapshot storage tests. Determine how to provide a snapshot saved on S3 from one TSC frequency and run restoration on a CPU with another; done means an integration test validates the restore path across differing frequencies.

Written by the indexing model from the issue text.