[tests] Fix test variations for monotouch-test.

[rolfbjarne]

These test variations need to go in the shared list of test variations,
because they contains conditional compilation symbols that need to be set for
referenced projects as well.

Also a few other improvements:

• Order the test variations identically between the item group with descriptions and the property groups.
• Add a sanity check to verify that if a test variation is specified, then something actually happens.
• Use 'TrimMode' instead of 'LinkMode'+'MtouchLink' - this avoids forgetting to set either 'LinkMode' or 'MtouchLink'.

[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: c950c1fba49218314858347cda45b85a689aab3d [PR build]

[vs-mobiletools-engineering-service2]

✅ [CI Build #c950c1f] Build passed (Build macOS tests) ✅

Pipeline on Agent
Hash: c950c1fba49218314858347cda45b85a689aab3d [PR build]

[vs-mobiletools-engineering-service2]

❌ [CI Build #c950c1f] Tests on macOS arm64 - Mac Tahoe (26) failed ❌

Tests on macOS arm64 - Mac Tahoe (26) failed for unknown reasons.

Pipeline on Agent
Hash: c950c1fba49218314858347cda45b85a689aab3d [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build #c950c1f] Tests on macOS X64 - Mac Sonoma (14) passed 💻

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

Pipeline on Agent
Hash: c950c1fba49218314858347cda45b85a689aab3d [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build #c950c1f] Tests on macOS M1 - Mac Monterey (12) passed 💻

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

Pipeline on Agent
Hash: c950c1fba49218314858347cda45b85a689aab3d [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build #c950c1f] Tests on macOS arm64 - Mac Sequoia (15) passed 💻

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

Pipeline on Agent
Hash: c950c1fba49218314858347cda45b85a689aab3d [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build #c950c1f] Tests on macOS M1 - Mac Ventura (13) passed 💻

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

Pipeline on Agent
Hash: c950c1fba49218314858347cda45b85a689aab3d [PR build]

[vs-mobiletools-engineering-service2]

🔥 [CI Build #c950c1f] Test results 🔥

Test results

❌ Tests failed on VSTS: test results

0 tests crashed, 2 tests failed, 115 tests passed.

Failures

❌ dotnettests tests (iOS)

1 tests failed, 0 tests passed.

• DotNet tests: Failed (Execution failed with exit code 1)

Html Report (VSDrops) Download

❌ introspection tests

1 tests failed, 3 tests passed.

• introspection/tvOS - simulator/Debug: Crashed

Html Report (VSDrops) Download

Successes

✅ cecil: 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
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 9 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 9 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: c950c1fba49218314858347cda45b85a689aab3d [PR build]

[vs-mobiletools-engineering-service2]

✅ [CI Build #970419d] Build passed (Build packages) ✅

Pipeline on Agent
Hash: 970419d82429bdf1c920859aa22d4f7eb4c0d198 [PR build]

[vs-mobiletools-engineering-service2]

✅ [PR Build #970419d] Build passed (Detect API changes) ✅

Pipeline on Agent
Hash: 970419d82429bdf1c920859aa22d4f7eb4c0d198 [PR build]