chore: release v2.12.0

[seemk]

• Add resourceFactory option for traces. Allows for customization of the detected resource. Previously a resource could be provided via tracerConfig, but this overwrote the detected attributes. For backwards compatibility the latter option is still possible. #938
• Support none value for OTEL_TRACES_EXPORTER and OTEL_METRICS_EXPORTER environment variables. #939
• Use the default OTEL_BSP_SCHEDULE_DELAY of 5000 instead of 500. This was a workaround for an old BatchSpanProcessor bug where it failed to flush spans fully. #940
• Disable log sending for Winston instrumentation by default. Add winston-transport package as a dependency in case log collection is enabled. #941
• Use a synchronous container detector from upstream. #944
• Add deprecation annotations to signal-specific start calls. #885
• Upgrade to OpenTelemetry 1.26.0 / 0.53.0. #945