onFinality Proposal for rpc services

https://docs.google.com/document/d/1Ca5HwOidMOcQrX5IRB1K18dX385m7tIlObfhN-Vk0bk/edit?tab=t.0

Due to a misconfiguration in a recent runtime upgrade, onFinality couldn't submit this proposal themselves, which is why this has to go through a referendum now.

Schedule a majority-carries referendum to be tabled next once it is legal to schedule
an external referendum.

The dispatch of this call must be `ExternalMajorityOrigin`.

- `proposal_hash`: The preimage hash of the proposal.

Unlike `external_propose`, blacklisting has no effect on this and it may replace a
pre-scheduled `external_propose` call.

Weight: `O(1)`

Propose and approve a spend of treasury funds.

## Dispatch Origin

Must be [`Config::SpendOrigin`] with the `Success` value being at least `amount`.

### Details
NOTE: For record-keeping purposes, the proposer is deemed to be equivalent to the
beneficiary.

### Parameters
- `amount`: The amount to be transferred from the treasury to the `beneficiary`.
- `beneficiary`: The destination account for the transfer.

## Events

Emits [`Event::SpendApproved`] if successful.

#75 Treasury Spend on Behalf of onFinality for rpc Services Q3 '25

No Active Proposals