Add option to override TRAP caching feature flag

[edoardopirovano]

This is a no-op for now, but let's add it in so DCA can opt out already without any warnings.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.

[esbena]

Perhaps add a comment about this being a noop, otherwise curious users will stumble upon it and complain that it does not work.