Add node_taints to aws_inventory script (#10168)

[mstoetzer]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Allows to add node_taints to be added to the ec2 instance tags.

Which issue(s) this PR fixes:

Fixes #10168

Special notes for your reviewer:
The last change to the aws_inventory script has been long time ago. REGION environment variable is also deprecated and has been renamed to AWS_REGION.

Does this PR introduce a user-facing change?:

Add node_taints to aws_inventory script 

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: mstoetzer / name: Michael Stötzer (d523316)

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[oomichi]

need to fix aws.md to pass the ci job.

[yankay]

Thanks @mstoetzer

/lgtm

[oomichi]

Thanks for fixing the issue.

/ok-to-test
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mstoetzer, oomichi

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