fix(api): centralize upsert validation + improve nested error handling

[tatarco]

feat(api): add upsert validation

What changed? Why was the change needed?

1. Established a single validation entry point for Upsert use case.
2. Fixed issue with nested validation based on @djabarovgeorge solution in an old open PR.
3. Removed the Base Command duplication so all commands use the same validation mechanism.
4. Fix Wrong Validations around issues in internal commands ( update + create)
5. Enhance the Filter to produce better and more detailed 400 errors around validation issues.
6. Make sure post process process update issues if no issues exist instead of empty object, the class validator does not handle empty object well for Record<string,?>
7. Added tests to validate correct behavior around tags and missing step name, make sure both fire good validation 400 erors

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Special notes for your reviewer

[linear]

NV-4918 Preview returns 500 if the step has a Missing Name

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commit: 5bb5222

[tatarco]

This needs to be here, either that or an exception in case of missing name, the entity allows missing names, but our API no more @SokratisVidros