By Chris Prentice and Carolyn Cohn WASHINGTON/LONDON (Reuters) -Wall Street notched broad gains on Friday, with the S&P 500 index closing at a record and global shares also finished at an all-time high, while oil prices rose for a fifth straight week. Weaker-than-expected inflation data and news that U.S. President Joe Biden has secured a bipartisan infrastructure agreement with lawmakers gave a boost to stocks. The plan is valued at $1.2 trillion over eight years, of which $579 billion is new spending. The S&P 500 rose 2.7% for the week, its strongest weekly gain since early February as Nike ...