[dotnet] Ensure appropriate IL Strip value for multi-rid builds

[haritha-mohan]

IsMultiRidBuild tracks if we are executing an inner build for a multi-rid case. With this approach, if the user specifies a value for EnableAssemblyILStripping it will still be honored. Otherwise, to ensure we don't duplicate assemblies when merging the app bundles due to a strip vs non-strip scenario, IL stripping for the multi-rid build is disabled by default.

There have been past examples of optimizing in the outer-build: #12847
But because IL Stripping is contingent on the evaluation of other RID-specific properties, not sure if that is a feasible approach here.

Fixes #17115

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[rolfbjarne]

It would also be interesting to see the app size for a Release build of a Mac Catalyst app before and after this change.

[rolfbjarne]

This doesn't actually test the default value, since you're setting the value in the test.

You need to build for "Release", not set EnableAssemblyILStripping, and then verify that the app's assemblies are not stripped (when building for two runtime identifiers).

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✅ [PR Build #e4835b2] Build passed (Build macOS tests) ✅

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💻 [PR Build #e4835b2] Tests on macOS X64 - Mac Sonoma (14) passed 💻

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💻 [PR Build #e4835b2] Tests on macOS M1 - Mac Monterey (12) passed 💻

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💻 [PR Build #e4835b2] Tests on macOS M1 - Mac Ventura (13) passed 💻

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💻 [PR Build #e4835b2] Tests on macOS arm64 - Mac Sequoia (15) passed 💻

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✅ API diff for current PR / commit

.NET ( No breaking changes )

• 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 (Breaking changes)

.NET ( ❗ Breaking changes ❗ )

• iOS: vsdrops gist ( ❗ Breaking changes ❗ )
• tvOS: vsdrops gist ( ❗ Breaking changes ❗ )
• MacCatalyst: vsdrops gist ( ❗ Breaking changes ❗ )
• macOS: vsdrops gist ( ❗ Breaking changes ❗ )

ℹ️ Generator diff

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

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🔥 [CI Build #e4835b2] Test results 🔥

Test results

❌ Tests failed on VSTS: test results

0 tests crashed, 2 tests failed, 112 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

❌ dotnettests tests (MacCatalyst)

1 tests failed, 0 tests passed.

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

Html Report (VSDrops) Download

Successes

✅ cecil: 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 4 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 10 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
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

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