[CoreBluetooth] Add Xcode 13 beta 3 support.

[mandel-macaque]

No description provided.

[spouliot]

it's not really available, just noise (and extra metadata for us), as the only API that use it is not available on macOS

		[iOS (13,0), TV (13,0), Watch (6,0), NoMac]
		[Static]
		[Export ("supportsFeatures:")]
		bool SupportsFeatures (CBCentralManagerFeature features);

let's just add that into the macOS-CoreBluetooth.ignore file instead

[vs-mobiletools-engineering-service2]

🔥 Tests failed catastrophically on Build (no summary found). 🔥

Result file $(TEST_SUMMARY_PATH) not found.

• Azure DevOps
• Html Report (VSDrops)

Pipeline on Agent
Merge 830b68d into 09f911b

[vs-mobiletools-engineering-service2]

❌ [PR Build] Tests failed on Build ❌

Tests failed on Build.

• Azure DevOps
• Html Report (VSDrops)

API diff

✅ API Diff from stable

View API diff

• iOS vsdrops gist
• macOS vsdrops gist
• macCat vsdrops gist
• macCatiOS gist
• tvOS vsdrops gist
• watchOS vsdrops gist

API & Generator diff

✅ API Diff (from PR only) (no change)
ℹ️ Generator Diff (please review changes)

GitHub pages

Results can be found in the following github pages (it might take some time to publish):

• Test results
• API diff
• API & Generator diff

Test results

1 tests failed, 85 tests passed.

Failed tests

• monotouch-test/Mac Catalyst/Debug [dotnet]: Failed (Tests run: 2629 Passed: 2494 Inconclusive: 35 Failed: 1 Ignored: 134)

Pipeline on Agent XAMBOT-1097.BigSur'
Merge 82b793e into eea8142

[mandel-macaque]

Known issue: https://github.com/xamarin/maccore/issues/2443

[rolfbjarne]

/sudo backport release/6.0.1xx-preview7

[vs-mobiletools-engineering-service2]

Backport Job to branch release/6.0.1xx-preview7 Created! The magic is happening here

[vs-mobiletools-engineering-service2]

Hooray! Backport succeeded! Please see https://devdiv.visualstudio.com/DevDiv/_build/results?buildId=5007565 for more details.