Plan B: Makefile package-extend target [DEVOPS-2394]

[jmsundar]

Summary

• Adds package-extend Make target to collector/Makefile that builds the collector zip with all 3 Extend configs bundled
• config.yaml is set to cx-only so the collector's default load path works without any env var
• Optionally, OPENTELEMETRY_COLLECTOR_CONFIG_URI can point to collector-config-cx-arize.yaml or collector-config-cx-arize-s3.yaml for Arize/S3 variants

Part of DEVOPS-2394. Base: feat/DEVOPS-2394-extend-otel-lambda (not main).

Test plan

• make -C collector package-extend GOARCH=amd64 succeeds
• unzip -l collector/build/opentelemetry-collector-layer-amd64.zip shows extensions/collector, collector-config/config.yaml, collector-config/collector-config-cx-arize.yaml, collector-config/collector-config-cx-arize-s3.yaml
• diff <(cat extend/collector-config-cx-only.yaml) <(unzip -p ... collector-config/config.yaml) is empty
• make -C collector package-extend GOARCH=arm64 succeeds with same zip structure

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