deployProtocolClients should not deploy client proxy anymore

[zajck]

Since #703 was merged, voucher proxy is deployed directly from the protocol.
This makes proxy deployment as part of the deployment script redundant.

Lines

boson-protocol-contracts/scripts/util/deploy-protocol-clients.js

Lines 36 to 40 in c1952c5

	// Deploy Protocol Client proxy contracts
	const protocolClientProxies = await deployProtocolClientProxies(protocolClientBeacons, maxPriorityFeePerGas);
	// Cast the proxies to their implementation interfaces ?? ToDo: what is this even needed?
	const protocolClients = await castProtocolClientProxies(protocolClientProxies);

should be removed to prevent unnecessary transactions during the protocol deployment or upgrade.