[Bug] PrometheusExporterOptions.global_tags not working for all metrics

[cretz]

Describe the bug

When investigating temporalio/sdk-python#775, it seems that setting global_tags on a PrometheusExporterOptionsBuilder, the tags are not present on most Prometheus metrics. It is available on target_info but no other metrics.

[Sushisource]

Needs a fix in otel before we can do this properly: open-telemetry/opentelemetry-rust#2858