feat(proxyd): ha redis namespace should be both backend group name and the namespace itself

[felipe-op]

Description

When two proxyd instances use the same HA redis instance, they need to scope to their own namespace otherwise it may cause cache key collision.

Part of https://github.com/ethereum-optimism/devinfra-pod/issues/110

[coderabbitai]

Walkthrough

Walkthrough

The update involves refining the instantiation process of a tracker object within a specific file. This enhancement is achieved by introducing a new variable, ns, which is crafted through formatting with parameters from the configuration and a background process name. This newly formed string is then utilized as a parameter in the function that creates the Redis consensus tracker, streamlining the setup process for tracking consensus in a more dynamic and configurable manner.

Changes

File(s)	Summary
proxyd/proxyd.go	Modified the tracker instance creation by introducing a new variable ns for dynamic namespace generation, used in NewRedisConsensusTracker.

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