Fix GPU E2E test failures

[movence]

Description of the issue

• kubectl rollout fails with timeout when checking the status of nvidia device plugin

Waiting for daemon set "nvidia-device-plugin-daemonset" rollout to finish: 0 of 1 updated pods are available...
error: timed out waiting for the condition

• destroy fails with unknown beta var

╷
│ Error: Invalid value for input variable
│ 
│   on variables.tf line 39:
│   39: variable "beta" {
│ 
│ Unsuitable value for var.beta set using -var="beta=...": a bool is
│ required.

Description of changes

• Replace kubectl rollout with simple sleep
• Drop beta vars in terraform commands

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Tests

https://github.com/aws/amazon-cloudwatch-agent/actions/runs/12165006108

Requirements

Before commit the code, please do the following steps.

1. Run make fmt and make fmt-sh
2. Run make lint