dont hard code values

Summary

stop hard coding of istio operator version

Relevant logs/screenshots

(Include any relevant logs/screenshots)

/cc @someoneelse

requested review from @joshwolf

just for brevity before merging, everything that's "hardcoded" can now be overriden by a user since we switched everything to valuesFrom secrets

but that being said, I get why youp'd want to keep the single source in the package itself, so LGTM

approved this merge request

merged

mentioned in commit 3ad6a71d