Type casting for change_column_type_concurrently

What does this MR do?

In !33955 (closed) I tried to change the type of the properties column in the services table from text to jsonb. We store json values in this column so it would be useful to use a jsonb type.

However, change_column_type_concurrently :services, :properties, :jsonb fails with

PG::DatatypeMismatch: ERROR:  column "properties_for_type_change" is of type jsonb but expression is of type text
LINE 1: ...ATE "services" SET "properties_for_type_change" = "services"...

This is because text can't be automatically translated to json. The query it executes when the value is copied to the temporary column is

UPDATE "services" SET "properties_for_type_change" = "services"."properties"

With the type_cast option added in this MR, the query will be:

UPDATE "services" SET "properties_for_type_change" = jsonb("services"."properties")

Screenshots

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