LPS-44372 Remove unused BufferedIncrementThreadLocal

CC @KocsisDaniel

BufferedIncrementThreadLocal was added by LPS-38695 at d6cfdb55daa774aff9620c1d2e46042a5b7df464, applied at 8e5673b0f6a7b25d0cac132c374b9d0ff26c8e81.

But it was never used anywhere. There is no reason to check this unused threadlocal on every @BufferedIncrement service method call.