Solax and GECloud fixes

What's Changed

• fix(gecloud): hold off a locked or offline device instead of retrying it by @springfall2008 in #6067
• docs(solax): Mode 8 control needs House Load Alt and Meter 2 sensors enabled (#6059) by @springfall2008 in #6070

Full Changelog: v9.7.6...v9.7.7