(Available without upgrading in Cloud Composer 3) Fixed load snapshot

## Fix Fixed _(Available without upgrading in Cloud Composer 3)_ Fixed load snapshot operations that were failing with invalid configuration error for the recently created snapshots. ## Fix Fixed _(Available without upgrading)_ Fixed an issue where Airflow workloads used the Performance Persistent Disk type (`pd-ssd`) instead of the Standard Persistent Disk type (`pd-standard`).