[CCA-1163] CCM Dashboards: Update snowflake and anthropic dashboards (DataDog#21745)

* update snowflake and anthropic dashboards

* remove unsupported setting

* Update anthropic_usage_and_costs/assets/dashboards/anthropic_usage_and_costs_overview.json

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Co-authored-by: cecilia saixue wat-kim <cecilia.watt@datadoghq.com>

Author: siobhanpmahoney