Telemetry units for duration metrics fixed

The following internal histogram metrics, accessible via the internal_metrics source were incorrectly suffixed with nanoseconds_total to indicate their unit as nanoseconds when they were in-fact representing seconds:

• request_duration_nanoseconds
• collect_duration_nanoseconds

These have been renamed to:

• request_duration_seconds
• collect_duration_seconds

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If you were consuming these metrics, you will need to update any dashboards or queries to use their new name.