The v1 export currently emits chart `params.datasource`, `params.slice_id`,
`params.dashboards`, and the datasource references inside `query_context`
even though the import path immediately overwrites them in
`update_chart_config_dataset`. That makes round-tripping an export through
a second environment produce a non-equal yaml diff for unchanged content.
Strip those instance-specific keys from `params`, and remove the
top-level / form_data / queries-level `datasource` references inside
`query_context` (the rest of `query_context` carries real chart logic
and is preserved). The dashboard `position.*.chartId` leak called out in
the same issue is left alone here because removing it requires also
migrating `metadata.{timed_refresh_immune_slices,filter_scopes,
expanded_slices,default_filters}` chart-id references to UUIDs.
Co-Authored-By: Claude <noreply@anthropic.com>
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