fix(flow-client): log the init failure hidden by the offline stub - #25731

fix(flow-client): log the init failure hidden by the offline stub#25731

Artur- merged 2 commits into

mainvaadin/flow:mainfrom

fix/log-swallowed-flow-ui-init-errorvaadin/flow:fix/log-swallowed-flow-ui-init-errorCopy head branch name to clipboard