fix: 新增 extensionEnv 处理 isIncognito (early-start & bgScript), userAgent (bgScript) 及 run-in (bgScript)#1368

CodFrm merged 8 commits intorelease/v1.4scriptscat/scriptcat:release/v1.4from

fix/isIncognito-value-in-early-startscriptscat/scriptcat:fix/isIncognito-value-in-early-startCopy head branch name to clipboard