added preserve field to true to avoid destroy issues

[vara-bonthu]

What does this PR do?

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• Added preserve=true for key managed add-ons to avoid destroy issues
• Updated Install and cleanup shell scripts with stuck terminating namespace
• pre-commit formatting

Motivation

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• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR to add a new Add-on for Terraform EKS Blueprints repo (if applicable)
• Yes, I have updated the website/docs or website/blog section for this feature
• Yes, I ran pre-commit run -a with this PR. Link for installing pre-commit locally

For Moderators

• E2E Test successfully complete before merge?

Additional Notes