deployment,apollo_deployments: drop config_format plumbing and retire preset config path

[nimrod-starkware]

Make native the sole config path in the cdk8s deploy and remove the now-dead
preset machinery:

• Delete the --config_format container arg (pod_builder) and the whole config_format
  plumbing (cli.py --config-format flag + threading through app.py, charts/node.py,
  constructs/{deployment,statefulset,configmap}). Phase 1 removed --config_format from
  the Rust node's parser, so emitting it to the container made the node panic on an
  unknown arg; the node now receives only --config_file. Verified by running the node
  on a synthesized native ConfigMap (reaches 'Finished loading configuration').
• Retire the python preset path: delete NodeConfigLoader and the $$$ placeholder-fill
  machinery (loaders.py); ConfigMap is always built via build_native_config.
• Remove the two preset-parity python tests + their preset-only helpers; keep all native
  mirror/deep-merge/port tests.

All hybrid overlays (mainnet, sepolia-alpha, sepolia-integration, testing/node-0,
testing/all-constructs) synth nested native; no synthesized container passes
--config_format; pytest test/ green.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

[reviewable-StarkWare]

This change is 

[nimrod-starkware]

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• apollo_deployments: delete Rust component-config topology mirror #14688
• apollo_deployments,apollo_integration_tests: source harness component configs from jsonnet #14687
• deployment: drop redundant YAML sequencerConfig; source port-uniqueness from jsonnet #14659
• apollo_config,workspace: remove SerializeConfig trait and preset-dump machinery #14654
• apollo_config,apollo_node_config,apollo_config_manager: rework get_config_presentation off dump() #14653
• apollo_node_config,apollo_node: delete CONFIG_POINTERS data and pointer-remap from secrets bin #14652
• apollo_node_config,apollo_config_manager,apollo_integration_tests: retire preset config-generation path #14651
• apollo_node_config,apollo_deployments: assert cross-component equality for formerly-pointer-resolved fields #14650
• apollo_deployments: delete base app_configs and the preset-parity test machinery #14649
• apollo_node_config,apollo_node,deployment: source private_parameters from secrets schema, drop value config schema #14648
• apollo_deployments: retire dead preset/replacer generation machinery #14647
• deployment,apollo_deployments: drop config_format plumbing and retire preset config path #14646 👈 (View in Graphite)
• deployment: add native config layers for the testing overlays #14645
• deployment: add dummy_for_testing native config override layer #14632
• apollo_config: make native the sole config-load path #14631
• apollo_config,apollo_node_config: make config fields with custom deserializers serialize symmetrically #14630
• apollo_integration_tests,apollo_node_config: load integration-test node config via native format #14629
• apollo_deployments: expose jsonnet build() evaluator behind a testing feature #14686
• deployment: extract base-layer start-block numbers into shared constants #14685
• deployment: add mainnet native config override layer #14628
• deployment: add sepolia-alpha native config override layer #14627
• apollo_deployments: test overrides list match #14626
• deployment: add sepolia-integration native config override (chain_params + replacers) #14674
• deployment: add native node-config builder and wire it into the ConfigMap #14609 : 1 other dependent PR (#14655 )
• deployment: thread config_format from CLI to node container arg #14608
• apollo_deployments,deployment: set storage-reader-server ports as constants #14607
• apollo_node: add new CLI arg to parse config #14606
• apollo_deployments: check applicative config matches deployed app_configs #14489 : 2 other dependent PRs (#14480 , #14505 )
• apollo_deployments: assemble and deserialize node config from jsonnet #14487
• apollo_deployments: assemble full node config via build.libsonnet #14486
• 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
• main

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PR Summary

Medium Risk
Large deletion of deployment config validation (placeholder/YAML parity) and a behavior change for every synthesized sequencer workload; misconfigured overlays now fail at jsonnet build time rather than preset validation.

Overview
Makes jsonnet native the only sequencer CDK8s config path and aligns synthesized pods with the Rust node CLI (no --config_format).

Removes the --config-format CLI flag and stops threading config_format through chart/construct constructors. ConfigMaps are always built via build_native_config; the preset branch (NodeConfigLoader, $$$ placeholder fill, YAML sequencerConfig overrides) is deleted from loaders.py. Pod args now pass only --config_file paths, since the node parser no longer accepts a format flag.

Doc/comments in native.py and secret.py are updated to reflect the single native path.

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