fix(argo-cd): Make REDIS_PASSWORD environment variables optional always

[shlomitubul]

Checklist:

• I have bumped the chart version according to versioning
• I have updated the documentation according to documentation
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.
• My build is green (troubleshooting builds).

[ArsenyBelorukov]

These changes leaded to a situation, when argocd can't reach redis after installations, because argocd-redis-secret-init job populates secret with redis password after argocd-server started.