apollo_deployments: assemble full node config via build.libsonnet

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• apollo_deployments: regression test hybrid evaluation #14509 : 2 dependent PRs (#14529 , #14530 )
• apollo_deployments: CLI tests using testing overrides #14508
• apollo_deployments: introduce new CLI #14507
• apollo_deployments: flat to nested json util #14506
• apollo_deployments: test overrides list match #14480
• apollo_deployments: jsonnet generation module #14505
• apollo_deployments: check applicative config matches deployed app_configs #14489
• apollo_deployments: assemble and deserialize node config from jsonnet #14487
• apollo_deployments: assemble full node config via build.libsonnet #14486 👈 (View in Graphite)
• apollo_deployments: distributed layout jsonnet test #14485
• apollo_deployments: consolidated layout jsonnet test #14484
• apollo_deployments: test hybrid layout for infra config #14483
• apollo_deployments: introduce hybrid layout for infra config #14482
• apollo_deployments: introduce jsonnet building blocks for infra config #14481
• apollo_deployments: jsonnet applicative config #14479
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PR Summary

Medium Risk
Deployment config assembly affects which components and L1 settings each node gets; mistakes could misconfigure production layouts, though layout names are asserted and logic is declarative.

Overview
Adds build.libsonnet, a top-level Jsonnet entry that assembles a full deployment layout into per-service SequencerNodeConfig objects via build(layoutName, overrides).

For each service in a layout (consolidated, hybrid, or distributed), it merges applicative config (only the *_config blocks for components that service runs), optional base_layer_config when L1 scrapers run there, shared monitoring_config, infra-derived components from derive.componentsFor, and a fixed validation_only: false.

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