Add script to clean-up unused AWS EC2 Instances and VPCs

[shivakunv]

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[tariq1890]

@shivakunv It'd be better if the cleanup bot follows the same sequence of operations as laid out in the holodeck delete.go file

[shivakunv]

passed piepline :
https://github.com/NVIDIA/holodeck/actions/runs/12416007697/job/34665439014

[shivakunv]

@shivakunv It'd be better if the cleanup bot follows the same sequence of operations as laid out in the holodeck delete.go file

followed delete.go sequence:-

terminateInstancesInput
deleteSecurityGroup
Delete the subnet
Delete the route tables
Delete the Internet Gateway
Delete the VPC

[tariq1890]

@shivakunv Please amend the commit and retitle the PR as follows

Add script to clean-up unused AWS EC2 Instances and VPCs"

[shivakunv]

Thanks @tariq1890 for reviewing.
incorporated the review comments. PTAL

passed pipeline:-
https://github.com/NVIDIA/holodeck/actions/runs/12427716870/job/34698013023

[shivakunv]

@cdesiniotis @tariq1890
suggestion :-
**- cron: "0 /4 * * "

Since we are deleting only e2e job resources (ci-*), shouldn’t we run this job every 4 hours?
with tag based change, Our cleanup bot will destroy only those resources that are completed.
Instead of running it daily at 8 AM UTC, we should schedule it to run every 4 hours.