Draft: loki update to 5.41.4-bb.4

General MR

Summary

• removed Istio.enabled from test-values
• enable testing

Relevant logs/screenshots

n/a

Linked Issue

mr - big-bang/product/packages/loki!133 (merged) issue - big-bang/product/packages/loki#81 (closed)

Upgrade Notices

n/a

closes big-bang/product/packages/loki#81 (closed)