Draft: Configure Alloy Mimir integration

Package Merge Request

Package Changes

• Only enables Alloy metrics/traces/logs when the appropriate corresponding back-end service packages are enabled
• Configures Alloy to write to Mimir, Prometheus, or both depending on which packages are enabled

Package MR

N/A

For Issue

Closes big-bang/product/packages/alloy#66 (closed)

Related big-bang/product/packages/alloy#69 (closed)

Upgrade Notices

N/A