Rename researchdelight hub to showcase

[sgibson91]

• rename researchdelight.2i2c.cloud to showcase.2i2c.cloud #3279

Things changed in this PR

• filenames that used researchdelight
• specific parts of config that references research delight
• sets up a redirect from researchdelight.2i2c.cloud to showcase.2i2c.cloud

Things not changed in this PR

• Kubernetes annotations that still use researchdelight. This PR does not update terraform in any way. These annotations cannot be seen by a user anyway so should not be problematic.
• Team names that contain research delight. Awaiting new teams.
• Image names that contain research delight. Awaiting new image.

What to do AFTER approval, but BEFORE merge

• Update A/CNAME records in Namecheap for new name
• Update URLs in GitHub OAuth app

What to do AFTER merge

• delete the old researchdelight namespace in helm

[github-actions]

Merging this PR will trigger the following deployment actions.

Support and Staging deployments

Cloud Provider	Cluster Name	Upgrade Support?	Reason for Support Redeploy	Upgrade Staging?	Reason for Staging Redeploy
aws	2i2c-aws-us	Yes	Following helm chart values files were modified: support.values.yaml	Yes	Following prod hubs require redeploy: showcase

Production deployments

Cloud Provider	Cluster Name	Hub Name	Reason for Redeploy
aws	2i2c-aws-us	showcase	Following helm chart values files were modified: enc-showcase.secret.values.yaml, showcase.values.yaml

[sgibson91]

This change means that a new hub and helm namespace will be deployed. Hence the need to delete the old researchdelight namespace documented in the top comment.

[consideRatio]

I appreciate seeing a redirect setup as well! Looks great!

[github-actions]

🎉🎉🎉🎉

Monitor the deployment of the hubs here 👉 https://github.com/2i2c-org/infrastructure/actions/runs/6626550925

[sgibson91]

Deployment of the support chart failed with:

Running helm upgrade --install --create-namespace --namespace=support --wait support /home/runner/work/infrastructure/infrastructure/helm-charts/support --values=/tmp/tmppb3i_j17 --values=/home/runner/work/infrastructure/infrastructure/config/clusters/2i2c-aws-us/support.values.yaml --values=/tmp/tmp3fl8bzz9
Error: UPGRADE FAILED: failed to create resource: admission webhook "validate.nginx.ingress.kubernetes.io" denied the request: nginx.ingress.kubernetes.io/configuration-snippet annotation cannot be used. Snippet directives are disabled by the Ingress administrator

This can be reproduced locally also.

[sgibson91]

Wondering if this is relevant? kubernetes/kubernetes#126811