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Use ReplacingMergeTree in ContributionAnalytics MV

Adam Hegyi requested to merge ah-use-replacing-merge-tree-for-ca-mv into master

What does this MR do and why?

This change alters the contribution_analytics_events table to use replacing merge tree. This MR does not affect the existing DB on ClickHouse cloud, the migration will be done by hand for now.

The main reasoning for the change is that we'll try to periodically rebuild the table using this strategy: #431453 (closed)

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