Merge bitcoin/bitcoin#36067: test: Remove `BOOST_CHECK_CLOSE` in favor of exact comparison

9e115edd39ffffa81b0b2a7eafada44ecf01c057 test: Remove `BOOST_CHECK_CLOSE` in favor of exact comparison (rustaceanrob)

Pull request description:

  `max_cache` is known ahead of time in this test as a `size_t` of `10000`, and each of these calculations should be known ahead of time (500.0, 9500.0). This test can truncate the double and assert exact equality rather than use a tolerance. Found in #35713 whereby this is the only use of this macro in the unit tests. IMO it is appropriate to tighten this test and remove the macro.

ACKs for top commit:
  maflcko:
    lgtm ACK 9e115edd39ffffa81b0b2a7eafada44ecf01c057
  josibake:
    ACK https://github.com/bitcoin/bitcoin/pull/36067/changes/9e115edd39ffffa81b0b2a7eafada44ecf01c057

Tree-SHA512: 738f05650bd1426e8e29e94955685e8ad3cd62e57f1c65b7af045161e4ca5af64bbd1f0cfed8da427a1f778620e3c8f7dfb835881f8de169806096213056e863