Bundle MongoDB Community Server 8.0.26 (8.0 LTS) and Database Tools
100.14.0, replacing 4.4.4 / 100.3.1. MongoDB 8.0 raises consumers'
minimum OS (the Linux build needs glibc 2.35+), so this is a major
version bump.

Highlights
- Native macOS arm64 (Apple Silicon): no more Rosetta 2, completing #127.
  Bundled platforms are now Windows x64, Linux x64 & arm64, macOS x64 & arm64.
- libcrypto.so.1.1 is no longer required: the Linux binaries are the
  ubuntu2204 build, linked against OpenSSL 3. Fixes #149 and #135.
- Fix "too many open files" (#147): dispose the chmod, import/export and
  replica-set-init processes/clients that leaked file descriptors on every
  runner start and every import/export.
- Strong-name the Mongo2Go assembly (#150) so it can be referenced from
  strong-named consumer projects. MongoDB.Driver has been strong-named since
  2.28.0, so the separate MongoDB.Driver.signed package is not needed.

MongoDownloader
- Cap concurrent llvm-strip and archive processing, stream downloads to disk,
  and compact the heap between archives, so a full multi-platform run stays
  within a modest RAM budget instead of being OOM-killed.
- Handle tar directory entries and close the zip extraction stream before
  stripping; both crashed extraction on the 8.x archives.
- Strip macOS binaries by removing the signature first, then ad-hoc re-sign
  arm64 so the stripped binary runs on Apple Silicon (unsigned arm64 is
  SIGKILLed by the kernel); the Intel x64 binary is left unsigned as before.
- Ship only the three executables per platform. Upstream licence terms are
  reproduced in README.md instead, keeping the package under nuget.org's
  250 MiB limit.

Repository storage
- The binaries are committed gzip-compressed (tools/**/bin/*.gz) because
  GitHub rejects files over 100 MB and the 8.x mongod binaries are larger.
  The build unpacks them on demand (PrepareMongoBinaries target); the
  decompressed executables are git-ignored. The manifest and the runtime
  verification still work on the decompressed binaries, unchanged.

Packaging
- The release job recompresses the .nupkg at maximum Deflate before pushing,
  reclaiming ~1.1 MiB, and fails the release if the package is still at or
  over the 250 MiB limit.

tools/**/*.gz and src/Mongo2Go/MongoBinaries.sha256 are regenerated together;
the runtime checksum manifest describes the (decompressed) binaries exactly.
All 49 tests pass against the real 8.0.26 binaries on macOS arm64, with
Mongo2Go.dll strong-named on both target frameworks.