Prune some log traces from examples

[Dhghomon]

The flag --log trace shows up in a lot of examples but for the most part doesn't fit the example and can even result in decreased performance as the database spends time logging everything. See surrealdb/surrealist#532 (comment)

This removes them in places where verbosity is not the subject, and makes it clear in other parts that it is being added to make the output verbose so that the reader knows that --log trace is only there for that specific case and doesn't need to be there otherwise.

Edit: Also replaces most of the remaining with --debug which is enough to demonstrate a more verbose output.

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