[xharness] Bump assembly-preparer test timeout to 30 minutes.

[rolfbjarne]

Increase the xharness timeout for assembly-preparer tests from 10 to 30 minutes to accommodate longer-running test execution.

Fixes #26528.

🤖 Pull request created by Copilot

[Copilot]

🟢 Approval recommended

The change is low-risk and directly addresses the reported harness timeout flake, with only an optional documentation nit noted.

Pull request overview

This PR increases the xharness timeout for the assembly-preparer unit test project to reduce CI flakiness where the harness hits its 10-minute deadline even after NUnit finishes successfully (per issue #26528).

Changes:

• Bump Assembly processing tests timeout from 10 minutes to 30 minutes in xharness project registration.

File summaries

File	Description
tests/xharness/Harness.cs	Increases the harness timeout for assembly-preparer tests to reduce intermittent CI timeouts.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

[vs-mobiletools-engineering-service2]

✅ API diff for current PR / commit

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• 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: 07900653488af66a5a9651595d4925c2fa5679b5 [PR build]

[vs-mobiletools-engineering-service2]

🚀 [CI Build #0790065] Test results 🚀

Test results

✅ All tests passed on VSTS: test results.

🎉 All 264 tests passed 🎉

Tests counts

✅ assembly-processing: All 1 tests passed. Html Report (VSDrops) Download
✅ 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 7 tests passed. Html Report (VSDrops) Download
✅ linker (iOS): All 31 tests passed. Html Report (VSDrops) Download
✅ linker (MacCatalyst): All 31 tests passed. Html Report (VSDrops) Download
✅ linker (macOS): All 21 tests passed. Html Report (VSDrops) Download
✅ linker (tvOS): All 31 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 25 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 25 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 20 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 25 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ sharpie: All 1 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

macOS tests

✅ Tests on macOS Sonoma (14): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Sequoia (15): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Tahoe (26): All 5 tests passed. Html Report (VSDrops) Download

Linux Build Verification

✅ Linux build succeeded

Pipeline on Agent
Hash: 07900653488af66a5a9651595d4925c2fa5679b5 [PR build]