Fix/monitor config populate defaults

[adkinsty]

fix: monitor config --enable must populate default monitor types

Problem

sodacli monitor config <dataset-id> --enable --schedule "0 6 * * *" currently fails against Soda Cloud with:

[Error] Failed validation of PublicApiUpdateDatasetRequest on the following properties:
body.metricMonitoring.datasetMetricMonitorsConfiguration:
Scan schedule and dataset metric monitors configuration must be provided
if metric monitoring is enabled

Root cause

The Cloud API now requires three fields together on metricMonitoring:

• enabled
• scanSchedule
• datasetMetricMonitorsConfiguration (the list: rowCount, freshness, schema, rowsInserted, totalRowCountChange, timeliness)

dataset onboard --monitoring already sends all three via the EnableDatasetDefaults helper in internal/api/monitors.go. But monitor config --enable has its own parallel implementation in cmd/monitor.go that was only sending enabled + scanSchedule, so the Cloud API rejects it with a 400.

This silently breaks per-dataset monitor enablement in scripts that call monitor config --enable directly (including the Fizz demo bootstrap, where every subsequent monitor add then errors with Metric monitoring is not enabled on dataset).

Fix

Populate the same default monitor types from both code paths.

• internal/api/monitors.go: export defaultDatasetMonitorTypes as DefaultDatasetMonitorTypes so it can be reused from cmd/.
• cmd/monitor.go: when --enable is set, build a DatasetMetricMonitorCfg slice from DefaultDatasetMonitorTypes and attach it to the request, matching what EnableDatasetDefaults does.

Verification

Against a local Soda Cloud:

sodacli monitor config <dataset-id> --enable --schedule "0 6 * * *" --profile fizz-demo
# ✓ Monitor config updated for dataset '<dataset-id>'. Monitors: enabled

sodacli monitor add --dataset <dataset-id> --type column --column email --metric missing-pct --profile fizz-demo
# ✓ Column monitor created

Both succeed. Before this fix, the first command 400s and the second then errors with "Metric monitoring is not enabled on dataset".