Enable :import_graceful_failures by default

What does this MR do?

Enable :import_graceful_failures by default. See #37057 (closed).

This will start to log import failures into the recently added import_failures table for everyone, but still allows us to disable the feature should something go awry.

We tested this with a large import and it should be a pretty safe change and in fact increase the likelihood for imports to succeed (not fail early) for everyone.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content