feat(platform)!: system data contracts should not have an owner

[QuantumExplorer]

Issue being fixed or feature implemented

Before this PR at genesis we created identities with keys that would become owners of system data contracts. Doing this brought with it the fact that the owner of the keys of these identities would be able to update the data contract.
This was not ideal, system contracts should only be updated by consensus.

What was done?

• We set the owner of the system contracts to [0;32] (only zeros). Since this identity does not exist and can never exist this will have the consequence that the system contracts will have no owner.

How Has This Been Tested?

Updated existing tests

Breaking Changes

It is only slightly breaking, as the root state will change.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone