Add configuration to create and use global block on a namespace

[kelanik8]

The following changes are implemented

TODO: Summary

Changes in the user interface:

TODO: Add screenshots, recordings or remove this section

Checklist when submitting a final (!draft) PR

• [ ] Commits are tidied up, squashed if needed and follow guidelines in CONTRIBUTING.md
• [ ] Code builds
• [ ] All existing tests pass
• [ ] All new critical code is covered by tests
• [ ] PR is linked to the relevant issue(s)
• [ ] Rebased with the target branch

[katrinDY]

A couple of questions:

• is the margin-top here intentional?

• after marking a block as global and copying it without reference, the new block isn't marked as global. Is this intentional? confirmed; it's fine

• after marking a block as global and copying it with reference, the new block is marked as global. Is this intentional? confirmed; it's fine

[github-actions[bot]]

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