chore(permission0): allow 0 weight recipients

[saiintbrisson]

This patch allows recipients to have 0 weights when permissions are updatable. This plays along recipient managers.

Closes CHAIN-138.

[linear]

CHAIN-138 allow setting weight to 0 in stream delegations

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/permission0/allow-0-weight-recipients

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[github-actions]

Package	Line Rate	Health
pallets.torus0.src	96%	✔
pallets.permission0.src.permission	84%	✔
pallets.governance.src	93%	✔
pallets.emission0.src.distribute	90%	✔
pallets.permission0.src	90%	✔
pallets.permission0.src.ext	90%	✔
pallets.permission0.api.src	100%	✔
pallets.torus0.api.src	79%	✔
pallets.emission0.src	92%	✔
Summary	91% (3511 / 3843)	✔

[github-actions]

Detailed coverage report

[functor-flow]

good to go