[tools] Use the apicompat tool to detect breaking changes.

[rolfbjarne]

Switch to using the apicompat tool to detect breaking API changes.

This has a few advantages:

• It's rather complex to detect breaking changes, and this way we don't have to
  maintain our own code.
• With apicompat it's easy to perform strict verification that doesn't allow any
  API additions either, which is useful for validating release branches (so this
  PR implements strict verification on release branches as well).
• With apicompat it's easy to add exclusions (suppressions) to allow an occasional
  API break if we ever wanted to. In fact we have to use this to ignore changes to
  [Experimental] API, which apicompat unfortunately doesn't understand.
• It allows us to simplify a lot of the code in the mono-api-html, which we strong-armed
  into finding breaking changes without it ever being designed to do so. We still
  keep mono-api-html to create API diffs in both html and markdown.

References:

• https://learn.microsoft.com/en-us/dotnet/fundamentals/apicompat/overview
• Add APICompat support for not flagging APIs with [Experimental] attributes sdk#50637

[vs-mobiletools-engineering-service2]

✅ [CI Build #919012c] Build passed (Build packages) ✅

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Hash: 919012cd3bffcc61cb5a8be28fdf093f7e3e5471 [PR build]

[vs-mobiletools-engineering-service2]

✅ [PR Build #919012c] Build passed (Detect API changes) ✅

Pipeline on Agent
Hash: 919012cd3bffcc61cb5a8be28fdf093f7e3e5471 [PR build]

[vs-mobiletools-engineering-service2]

✅ API diff for current PR / commit

NET (empty diffs)

• iOS: vsdrops gist ( No breaking changes )
• tvOS: vsdrops gist ( No breaking changes )
• MacCatalyst: vsdrops gist ( No breaking changes )
• macOS: vsdrops gist ( No breaking changes )

✅ API diff vs stable

NET (empty diffs)

• iOS: vsdrops gist ( No breaking changes )
• tvOS: vsdrops gist ( No breaking changes )
• MacCatalyst: vsdrops gist ( No breaking changes )
• macOS: vsdrops gist ( No breaking changes )

ℹ️ Generator diff

Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

Pipeline on Agent
Hash: 919012cd3bffcc61cb5a8be28fdf093f7e3e5471 [PR build]

[vs-mobiletools-engineering-service2]

✅ [CI Build #919012c] Build passed (Build macOS tests) ✅

Pipeline on Agent
Hash: 919012cd3bffcc61cb5a8be28fdf093f7e3e5471 [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build #919012c] Tests on macOS X64 - Mac Sonoma (14) passed 💻

✅ All tests on macOS X64 - Mac Sonoma (14) passed.

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Hash: 919012cd3bffcc61cb5a8be28fdf093f7e3e5471 [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build #919012c] Tests on macOS M1 - Mac Monterey (12) passed 💻

✅ All tests on macOS M1 - Mac Monterey (12) passed.

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Hash: 919012cd3bffcc61cb5a8be28fdf093f7e3e5471 [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build #919012c] Tests on macOS arm64 - Mac Tahoe (26) passed 💻

✅ All tests on macOS arm64 - Mac Tahoe (26) passed.

Pipeline on Agent
Hash: 919012cd3bffcc61cb5a8be28fdf093f7e3e5471 [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build #919012c] Tests on macOS M1 - Mac Ventura (13) passed 💻

✅ All tests on macOS M1 - Mac Ventura (13) passed.

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[vs-mobiletools-engineering-service2]

💻 [CI Build #919012c] Tests on macOS arm64 - Mac Sequoia (15) passed 💻

✅ All tests on macOS arm64 - Mac Sequoia (15) passed.

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Hash: 919012cd3bffcc61cb5a8be28fdf093f7e3e5471 [PR build]

[vs-mobiletools-engineering-service2]

🚀 [CI Build #919012c] Test results 🚀

Test results

✅ All tests passed on VSTS: test results.

🎉 All 117 tests passed 🎉

Tests counts

✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
✅ generator: All 5 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 6 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 8 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 11 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 9 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 8 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ windows: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

Pipeline on Agent
Hash: 919012cd3bffcc61cb5a8be28fdf093f7e3e5471 [PR build]