[devops] Fan the linker tests out per platform.

[rolfbjarne]

The linker tests are now our longest-running tests (a bit over an hour), so
fan them out to run on separate bots on a per-platform basis to speed them
up.

[Copilot]

Pull request overview

This PR updates the Azure DevOps test matrix configuration so the linker test suite is generated as separate per-platform jobs (similar to existing per-platform suites), reducing end-to-end wall clock time by running linker tests in parallel across bots.

Changes:

• Update devops documentation to note linker tests are now split by platform.
• Enable per-platform matrix generation for the linker test configuration and explicitly disable the “Multiple platforms” aggregate run for that suite.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tools/devops/README.md	Updates the test configuration list to reflect that linker tests are now split by platform.
tools/devops/automation/templates/common/configure.yml	Switches linker to splitByPlatforms: true and sets needsMultiplePlatforms: false to fan out jobs without adding a Multiple run.

[vs-mobiletools-engineering-service2]

✅ [PR Build #46cfa7a] Build passed (Detect API changes) ✅

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[vs-mobiletools-engineering-service2]

✅ [PR Build #46cfa7a] Build passed (Build packages) ✅

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Hash: 46cfa7ac1ce927798d02f1ef9d931e07b9170a62 [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: 46cfa7ac1ce927798d02f1ef9d931e07b9170a62 [PR build]

[vs-mobiletools-engineering-service2]

✅ [PR Build #46cfa7a] Build passed (Build macOS tests) ✅

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Hash: 46cfa7ac1ce927798d02f1ef9d931e07b9170a62 [PR build]

[vs-mobiletools-engineering-service2]

🚀 [CI Build #46cfa7a] Test results 🚀

Test results

✅ All tests passed on VSTS: test results.

🎉 All 183 tests passed 🎉

Tests counts

✅ cecil: All 1 tests passed. (⚠️ Html Report Publish failed ⚠️) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. (⚠️ Html Report Publish failed ⚠️) 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 (iOS): All 11 tests passed. Html Report (VSDrops) Download
✅ linker (MacCatalyst): All 11 tests passed. Html Report (VSDrops) Download
✅ linker (macOS): All 11 tests passed. (⚠️ Html Report Publish failed ⚠️) Download
✅ linker (tvOS): All 11 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 18 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 20 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 20 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ monotouch (tvOS): All 18 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. [attempt 2] Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

macOS tests

✅ Tests on macOS Monterey (12): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Ventura (13): All 5 tests passed. Html Report (VSDrops) Download
✅ 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: 46cfa7ac1ce927798d02f1ef9d931e07b9170a62 [PR build]