Revert "Add mkosi flashbots-images VM to playground"

[canercidam]

Reverts #302

[claude]

Claude finished @canercidam's task in 2m 36s —— View job

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Review of PR #365: Revert "Add mkosi flashbots-images VM to playground"

• Gather context and understand the revert scope
• Review modified Go files for correctness
• Review deleted files for completeness
• Check for any unintended changes
• Post review summary

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This is a clean revert of PR #302. I reviewed all 24 changed files and the revert looks correct. The changes properly restore the pre-#302 state:

Go code changes - All modifications are clean reversals:

• components.go: Restores --target-peers 0 (from 1), re-enables healthmon for Lighthouse beacon and MevBoostRelay, removes Fileserver component, simplifies registerBuilderHook signature and postHook.Action signature back to func(s *Service) error, removes builderHubConfig struct and embedded default config
• manifest.go: Restores postHook.Action to func(s *Service) error (removing *Manifest param)
• recipe_buildernet.go: Removes BuilderHostIPAddress const, removes beacon/reth API lookups from registerBuilder, simplifies function signature
• recipe_l1.go: Removes Fileserver component from L1 recipe
• artifacts.go: Removes ElectraForkEpoch = 0 and embedded builderhub-config.yaml
• components_test.go: Updates registerBuilder call to match reverted 2-arg signature

Deleted files - All 16 files under scripts/buildernet-vm/ and playground/utils/builderhub-config.yaml are correctly removed.

Dependencies - go-ethereum reverts from v1.16.8 to v1.16.3, golang/snappy from v1.0.0 to v0.0.5-pre. golang.org/x/time changes from v0.9.0 to v0.11.0 (this is an upgrade, not a downgrade — likely due to transitive dependency resolution).

No issues found. The revert is clean and complete.