Staking (EPMB): Add defensive error handling to voter snapshot creation and solution verification#8687

sigurpol merged 11 commits intomasterparitytech/polkadot-sdk:masterfrom

sigurpol/epmb_no_unwrap_on_initparitytech/polkadot-sdk:sigurpol/epmb_no_unwrap_on_initCopy head branch name to clipboard