fix redis condition in helm requirements.yaml
"It appears that you cannot have a negation in a condition in requirements.yaml dependencies and so the redis pods appear to always get started up regardless of whether redis.external==true.
Furthermore, listing a series of comma separated conditions appears to greedily decide based on the first non-undefined value in the list.
Test Plan: integration
Reviewed By: rexledesma
Differential Revision: https://dagster.phacility.com/D6663