[GA] Autofill ECS cluster info if it's missing

[bjrara]

Description of issues

1. OTEL resource detection processor is unable to detect ECS cluster information.

2024-05-01T18:23:58Z I! {
    "caller": "internal/resourcedetection.go:139",
    "msg": "detected resource information",
    "kind": "processor",
    "name": "resourcedetection",
    "pipeline": "traces/application_signals",
    "resource": {}
}

Description of changes

1. This PR reads ECS cluster name from CWA if it's not populated from SDK side.
2. This PR completes a TODO after semconv version has bumped to 1.22.

License

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Tests

Describe what tests you have done.

Requirements

Before commit the code, please do the following steps.

1. Run make fmt and make fmt-sh
2. Run make lint