Summary

This PR introduces the following updates to AppService to be compatible with rocketpool v.1.18.1 release:

• Updates the node can-set-withdrawal-address cmd to node can-set-primary-withdrawal-address
• Updates the node can-deposit amount min-fee salt cmd to api node can-deposit amount min-fee salt use-express-ticket and sets the use-express-ticket argument to false by default
• Updates the node deposit amount min-node-fee salt use-credit-balance submit cmd to node deposit amount min-node-fee salt use-credit-balance use-express-ticket submit and sets the use-express-ticket argument to false by default
• Code cleanup: deletes the getNodeCanRegister() function and the NodeCanRegister.ts type, as these were not being used (frontend always uses the canRegisterNode() function).

Special request

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Please add the hacktoberfest-accepted label to this PR before merging so it counts as an open source contribution to this year's Hacktoberfest 🙏
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