refactor!: StakingAssetHandler is a normal faucet #19136
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Refactors the StakingAssetHandler to function like a "normal" faucet. That is, the user submits a zkpassport proof and gets a lump sum of tokens (1M by default).
To do so, it bumps the zkpassport version to 0.15.0, and so needs to bump solc version to 0.8.30.
Contract deployed to https://sepolia.etherscan.io/address/0xD966ce81B6E6eD5A96219DDF896258CBd04eaa69
It also demonstrates use of the new "updating-changelog" claude skill. I asked claude code to "update the changelogs".