Upgrade Fluent-Bit Chart to 0.15.3

The latest image for Fluent-bit is in IronBank (1.7.2) Update the upstream chart referenced in our BigBang Chart to 0.15.3 to use this new image and chart features.

We need to

• Architecture Review of changes in major components
• Identify all images needing updates
• Get images through Iron Bank
• Update Chart with changes