Market heavyweights such as Apple Inc AAPL.O and Tesla TSLA.O rose 0.9% and 0.5% in premarket trading. By Sruthi Shankar and Anisha Sircar June 24 (Reuters) - Wall Street's main indexes were set to open higher on Friday as signs of slowing economic growth and falling commodity prices eased expectations over how aggressively the Federal Reserve will raise interest rates to rein in inflation. Data on Thursday showed U.S. business activity slowed considerably in June, driving investors to scale back bets on where interest rates may peak.