Prepare to remove trace column from ci_builds

What does this MR do and why?

Related to #18605 (closed)

It removes all application code that was still using the column(i.e., reading the trace from the database) and adds the ignore rule needed for removal.

This column is be safe to remove because it's not being used for writes since before %9.0 and in %11.0 it was added a background migration to archive existing builds with traces in the database.

On .com it looks like there are only a couple of old records that still have data stored this way: #18605 (comment 1058496381)

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