Remove unnecessary example entry from workflow DB migration

[bolekk]

We don't want to add sample entries to all nodes everywhere.

Whichever nodes were already affected by this (e.g. staging) will have an extra entry, which could be removed together with the job spec.

[github-actions]

I see you updated files related to core. Please run pnpm changeset in the root directory to add a changeset as well as in the text include at least one of the following tags:

#nops : For any feature that is NOP facing and needs to be in the official Release Notes for the release.
#added : For any new functionality added.
#changed : For any change to the existing functionality. 
#removed : For any functionality/config that is removed.
#updated : For any functionality that is updated.
#deprecation_notice : For any upcoming deprecation functionality.
#breaking_change : For any functionality that requires manual action for the node to boot.
#db_update : For any feature that introduces updates to database schema.
#wip : For any change that is not ready yet and external communication about it should be held off till it is feature complete.
#bugfix - For bug fixes.
#internal - For changesets that need to be excluded from the final changelog.

[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
4 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube