Delete app kustomize code

[sastels]

What are you changing?

• Changing kubernetes configuration

Provide some background on the changes

Clean up the kustomization code we're not using anymore 🎉

Checklist if making changes to Kubernetes

• I know how to get kubectl credentials in case it catches on fire

After merging this PR

• I have verified that the tests / deployment actions succeeded
• I have verified that any affected pods were restarted successfully
• I have verified that I can still log into Notify production
• I have verified that the smoke tests still pass on production
• I have communicated the release in the #notify Slack channel.

[github-actions]

fb-agent	amazon-cloudwatch	2       	2025-02-13 15:23:32.968462765 +0000 UTC	deployed	fluent-bit-0.48.5	3.2.4      

ingress	nginx    	261     	2025-02-13 15:23:32.986172903 +0000 UTC	deployed	nginx-ingress-1.1.2	3.4.2      

xray-daemon	xray     	260     	2025-02-13 15:23:33.236939647 +0000 UTC	deployed	aws-xray-4.0.8	3.3.12     

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