new single user image with ipystack_leaflet

[ranchodeluxe]

This PR adds a new singleuser image as the default to https://nasa-veda.2i2c.cloud/. It's related to the freshdesk ticket (wish the emails showed the related freshdesk IDs) that Sarah Gibson has responded to.

VEDA has an image building pipeline in place so scientists can build custom images (basically waiting for this custom options spawner feature to be released) leveraging the ONBUILD command that pangeo uses in it's base image.

Relevant info:

Repository: https://github.com/NASA-IMPACT/veda-jh-environments/

Base Image: https://github.com/NASA-IMPACT/veda-jh-environments/blob/main/docker-images/base/pangeo-notebook/Dockerfile

Singleuser Image: https://github.com/NASA-IMPACT/veda-jh-environments/tree/main/docker-images/custom/nasa-veda-singleuser

Public ECR: public.ecr.aws/nasa-veda/

[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	nasa-veda	No		Yes	Following helm chart values files were modified: common.values.yaml

Production deployments

Cloud Provider	Cluster Name	Hub Name	Reason for Redeploy
aws	nasa-veda	prod	Following helm chart values files were modified: common.values.yaml

[github-actions]

🎉🎉🎉🎉

Monitor the deployment of the hubs here 👉 https://github.com/2i2c-org/infrastructure/actions/runs/5859819852