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Add side_by_side mode to update_materialized_view #409

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Run time

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Job	Run time
Ruby 3.4, Rails 8.0	1m 18s
Lint with Standard	13s
Ruby 3.4, Rails 7.2	1m 19s
Ruby 3.3, Rails 8.0	1m 18s
Ruby 3.3, Rails 7.2	1m 20s
Ruby 3.4, Rails main	1m 19s
Ruby head, Rails main	2m 35s
	9m 22s