Add pagerduty and prometheus integration info to support chart secrets

[sgibson91]

This information could be used by prometheus alertmanager to send automatic alerts

Set up following these instructions: https://www.pagerduty.com/docs/guides/prometheus-integration-guide/

related to #5062

[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
gcp	leap	Yes	Support helm chart has been modified	No
aws	gridsst	Yes	Support helm chart has been modified	No
kubeconfig	queensu	Yes	Support helm chart has been modified	No
gcp	2i2c-uk	Yes	Support helm chart has been modified	No
aws	maap	Yes	Support helm chart has been modified	No
aws	nasa-cryo	Yes	Support helm chart has been modified	No
gcp	2i2c	Yes	Support helm chart has been modified	No
gcp	awi-ciroh	Yes	Support helm chart has been modified	No
aws	jupyter-health	Yes	Support helm chart has been modified	No
gcp	dubois	Yes	Support helm chart has been modified	No
gcp	hhmi	Yes	Support helm chart has been modified	No
aws	earthscope	Yes	Support helm chart has been modified	No
kubeconfig	utoronto	Yes	Support helm chart has been modified	No
aws	smithsonian	Yes	Support helm chart has been modified	No
aws	victor	Yes	Support helm chart has been modified	No
aws	openscapes	Yes	Support helm chart has been modified	No
aws	kitware	Yes	Support helm chart has been modified	No
aws	nmfs-openscapes	Yes	Support helm chart has been modified	No
aws	nasa-ghg	Yes	Support helm chart has been modified	No
aws	catalystproject-africa	Yes	Support helm chart has been modified	No
aws	2i2c-aws-us	Yes	Support helm chart has been modified	No
gcp	catalystproject-latam	Yes	Support helm chart has been modified	No
aws	strudel	Yes	Support helm chart has been modified	No
aws	projectpythia	Yes	Support helm chart has been modified	No
gcp	cloudbank	Yes	Support helm chart has been modified	No
aws	jupyter-meets-the-earth	Yes	Support helm chart has been modified	No
gcp	pangeo-hubs	Yes	Support helm chart has been modified	No
aws	ubc-eoas	Yes	Support helm chart has been modified	No
aws	nasa-veda	Yes	Support helm chart has been modified	No
aws	opensci	Yes	Support helm chart has been modified	No

Production deployments

No production hub upgrades will be triggered

[github-actions]

🎉🎉🎉🎉

Monitor the deployment of the hubs here 👉 https://github.com/2i2c-org/infrastructure/actions/runs/12178194167

[yuvipanda]

I think this needs a possible addition to the json schema as well - trying to run deploy-support nasa-veda fails with:

Error: UPGRADE FAILED: values don't meet the specifications of the schema(s) in the following chart(s):
support:
- (root): Additional property pagerduty-prometheus-integration is not allowed

[sgibson91]

@yuvipanda it's getting changed in another PR where Tarashish is actually turning on alert manager