Convert LCOV line numbers explicitly and refresh the amalgamationfeature/per-test-coverage

- The 32-bit MSVC jobs failed on C4244: ParseLcov used the uint64_t it
  read as a std::size_t map key. The line number is now converted once,
  explicitly, before it is used.
- extras/catch_amalgamated.cpp is regenerated with
  bazelisk run //tools:amalgamate, so it holds CoverageReport and the
  scheduler changes; bazel run //tools:check passes locally.

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