internal/telemetry: support DD_TELEMETRY_HEARTBEAT_INTERVAL #1475
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This change decouples the heartbeat signal and flushing data to the backend, and adds support for a configurable DD_TELEMETRY_HEARTBEAT_INTERVAL environment variable.
See https://github.com/DataDog/instrumentation-telemetry-api-docs/blob/main/GeneratedDocumentation/ApiDocs/v1/producing-telemetry.md#configurable-interval for more details.