enhancement(quicksight): add label block to scatter_plot_categorically_aggregated_field_wells

[kittu2611]

Description

Adds support for the label block inside scatter_plot_categorically_aggregated_field_wells
for the aws_quicksight_dashboard and aws_quicksight_analysis resources.

The QuickSight API supports the Label field for
ScatterPlotCategoricallyAggregatedFieldWells, but the Terraform provider
schema currently does not expose it. This results in the error:

Blocks of type "label" are not expected here.

Changes

• Add label schema block using dimensionFieldSchema
• Implement expand logic in expandScatterPlotCategoricallyAggregatedFieldWells
• Implement flatten logic in flattenScatterPlotCategoricallyAggregatedFieldWells

References

AWS API:
https://docs.aws.amazon.com/quicksight/latest/APIReference/API_ScatterPlotCategoricallyAggregatedFieldWells.html

Fixes #46529

[github-actions]

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[github-actions]

✅ Thank you for correcting the previously detected issues! The maintainers appreciate your efforts to make the review process as smooth as possible.