r/aws_quicksight_{analysis,dashboard}: flatten/expand theme_arn.

[gbw]

Description

Adds flatten/expand for theme_arn for resources aws_quicksight_analysis, aws_quicksight_dashboard.

Relations

Closes #33524

References

QuickSight Documentation

Output from Acceptance Testing

I lack permissions to test this.

[github-actions]

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[gbw]

Already done in PR #31737

[github-actions]

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