Bring proto files inline with styling guide

[foot]

Part of #3220

Add more rules to .protolint.yaml

• RPCS_HAVE_COMMENT
• FIELD_NAMES_LOWER_SNAKE_CASE

What changed?

• The main motivation was to fix the camelCase -> snake_case style convention
• To address the "require RPC method documentation" FIXME's have been added temporarily. We'll do a follow up PR to address descriptions on methods.

Why was this change made?

Tidy up before publishing API

How did you validate the change?

• Code still builds
• Tests still pass
• Smoke still passes

Follow ups

• Add docs for each method that has a FIXME
• Review existing docs

[bigkevmcd]

Should we add an action to check these?

[foot]

Should we add an action to check these?

Turns out we do actually run it.

https://github.com/weaveworks/weave-gitops-enterprise/actions/runs/6745162221/job/18336814545?pr=3589#step:5:40

[bigkevmcd]

Should we add an action to check these?

Turns out we do actually run it.

https://github.com/weaveworks/weave-gitops-enterprise/actions/runs/6745162221/job/18336814545?pr=3589#step:5:40

Ahh, awesome, thanks for tightening the rules!