Update all upstreams based on Helm stable deprecation

Summary

Given the Helm stable repository deprecation timeline, we should look to update all out charts to there "new" homes prior to the "de-listing" of stable/* from Helm Hub, and likely the long-tail ending where the storage for them goes away.

We're given impetus for this by the increased number of charts from stable issuing THIS CHART IS DEPRECATED warnings in NOTES.txt

Details

Date	Description
Nov 13, 2019	At Helm 3's public release, new charts are no longer accepted to stable or incubator. Patches to existing charts may continue to be submitted by the community, and (time permitting) reviewed by chart OWNERS for acceptance
May 13, 2020	At 6 months – when helm v2 goes security fix only – the stable and incubator repos will be de-listed from the Helm Hub. Chart OWNERS are encouraged to accept security fixes only
Nov 13, 2020	At 1 year, support for this project will formally end, and this repo will be marked obsolete

Known impacts:

• Charts
  • Prometheus
  • Grafana
  • PostgreSQL
  • Redis
• Scripts
  • external-dns

Note: When this issue is worked, we should convert to an Epic, and work each set individually.

Versions

• Chart: 1fe69de5a03be7bfc0b80dec45390bc485166751, 3.2.1+