deployment: support include directive in common yaml loader

[nimrod-starkware]

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[nimrod-starkware]

• deployment: make gcpPodMonitoring enable configurable #14240
• deployment: fix storage reader port #14229
• deployment: add service ports to hybrid common service overlays #14215
• deployment: extract common env to hybrid/common/common.yaml #14249
• deployment: extract core common config #14248
• deployment: extract mempool common config #14247
• deployment: extract gateway common config #14246
• deployment: extract l1 common config #14245
• deployment: extract committer common config #14244
• deployment: extract sierra-compiler common config #14243
• deployment: support include directive in common yaml loader #14242 👈 (View in Graphite)
• deployment: add gcp pod monitoring to hybrid environment overlays #14192 : 1 other dependent PR (#14196 )
• deployment: add liveness probe to hybrid environment overlays #14191
• deployment: add readiness probe to hybrid environment overlays #14190
• deployment: add startup probe to hybrid environment overlays #14188
• deployment: add monitoring endpoint port to hybrid environment overlays #14187
• main-v0.14.3

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[reviewable-StarkWare]

This change is 

[cursor]

PR Summary

Medium Risk
Changes how layout/overlay common config is assembled; mis-resolved includes or merge order could alter deployed sequencer settings without touching service YAML.

Overview
Common YAML loading now resolves include: fragments the same way service configs already do, instead of reading a single file with yaml.safe_load.

_load_common_yaml takes an optional config_base_dir and uses DeploymentConfigLoader._load_one_file_with_includes before CommonConfig validation. merge_configs passes config_base_dir when loading layout and overlay common.yaml paths so relative includes resolve from the deployment root.

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