[ObsUX][APM] Rename observability setting apmEnableMultiSignal to entityCentricExperience#188097

jennypavlova merged 2 commits intoelastic:mainelastic/kibana:mainfrom

jennypavlova:3731-change-advanced-setting-name-and-text-for-observabilityapmenablemultisignaljennypavlova/kibana:3731-change-advanced-setting-name-and-text-for-observabilityapmenablemultisignalCopy head branch name to clipboard