WPB-16060: set production-like default Helm values for shutdownGracePeriod

[lwille]

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What's new in this PR?

Issues

We always needed to override these values per environment. Since SFT supports draining, we can now confidently set a high default shutdownGracePeriod which should be appropriate for all environments.

Testing

How to Test

This was already tested by overriding the values from Terraform and applying to staging.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud