[wkwebkit] Add nullability to (generated and manual) bindings

[tj-devel709]

This PR aims to bring nullability changes to WKWebKit.
Following the steps here:

1. Changing any == null or != null to is null and is not null

[vs-mobiletools-engineering-service2]

🔥 Tests failed catastrophically on VSTS: simulator tests iOS (no summary found). 🔥

Result file D:\a\1\s\Reports\TestSummary-simulator\TestSummary.md not found.

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Pipeline on Agent XAMBOT-1101.Monterey'
Merge a0df185 into 1be1d74

[vs-mobiletools-engineering-service2]

🔥 Tests failed catastrophically on VSTS: simulator tests iOS (no summary found). 🔥

Result file D:\a\1\s\Reports\TestSummary-simulator\TestSummary.md not found.

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Pipeline on Agent XAMBOT-1039.Monterey'
Merge 3480ca6 into 01459ae

[vs-mobiletools-engineering-service2]

📚 [PR Build] Artifacts 📚

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• Microsoft.iOS.Bundle.15.4.63-ci.pr.gh14955.pkg
• Microsoft.iOS.Ref.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.iOS.Runtime.ios-arm.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.iOS.Runtime.ios-arm64.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.iOS.Runtime.iossimulator-arm64.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.iOS.Runtime.iossimulator-x64.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.iOS.Runtime.iossimulator-x86.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.iOS.Sdk.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.iOS.Templates.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.iOS.Windows.Sdk.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.MacCatalyst.Bundle.15.4.63-ci.pr.gh14955.pkg
• Microsoft.MacCatalyst.Ref.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-arm64.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-x64.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.MacCatalyst.Sdk.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.MacCatalyst.Templates.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.macOS.Bundle.12.3.63-ci.pr.gh14955.pkg
• Microsoft.macOS.Ref.12.3.63-ci.pr.gh14955.nupkg
• Microsoft.macOS.Runtime.osx-arm64.12.3.63-ci.pr.gh14955.nupkg
• Microsoft.macOS.Runtime.osx-x64.12.3.63-ci.pr.gh14955.nupkg
• Microsoft.macOS.Sdk.12.3.63-ci.pr.gh14955.nupkg
• Microsoft.macOS.Templates.12.3.63-ci.pr.gh14955.nupkg
• Microsoft.NET.Sdk.iOS.Manifest-6.0.300.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.NET.Sdk.MacCatalyst.Manifest-6.0.300.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.NET.Sdk.macOS.Manifest-6.0.300.12.3.63-ci.pr.gh14955.nupkg
• Microsoft.NET.Sdk.tvOS.Manifest-6.0.300.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.NET.Workload.iOS.15.4.63-ci.pr.gh14955.msi
• Microsoft.tvOS.Bundle.15.4.63-ci.pr.gh14955.pkg
• Microsoft.tvOS.Ref.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.tvOS.Runtime.tvos-arm64.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-arm64.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-x64.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.tvOS.Sdk.15.4.63-ci.pr.gh14955.nupkg
• Microsoft.tvOS.Templates.15.4.63-ci.pr.gh14955.nupkg
• xamarin.ios-15.11.0.251.pkg
• xamarin.mac-8.11.0.251.pkg

Pipeline on Agent XAMBOT-1105.Monterey'
Hash: b8eb53240bc7dca303be333832879daf9ce065f5

[vs-mobiletools-engineering-service2]

💻 [PR Build] Tests on macOS Mac Catalina (10.15) passed 💻

✅ All tests on macOS Mac Catalina (10.15) passed.

Pipeline on Agent
Hash: b8eb53240bc7dca303be333832879daf9ce065f5

[vs-mobiletools-engineering-service2]

💻 [PR Build] Tests on macOS M1 - Mac Big Sur (11.5) passed 💻

✅ All tests on macOS M1 - Mac Big Sur (11.5) passed.

Pipeline on Agent
Hash: b8eb53240bc7dca303be333832879daf9ce065f5

[vs-mobiletools-engineering-service2]

📋 [PR Build] API Diff 📋

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• iOS vsdrops gist
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• dotnet-MacCatalyst vsdrops gist

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• iOS vsdrops gist
• macOS vsdrops gist
• tvOS vsdrops gist
• watchOS vsdrops gist

View dotnet API diff

• dotnet-iOS vsdrops gist
• dotnet-macOS vsdrops gist
• dotnet-tvOS vsdrops gist
• dotnet-MacCatalyst vsdrops gist

View dotnet legacy API diff

• dotnet-legacy-iOS vsdrops gist
• dotnet-legacy-macOS vsdrops gist
• dotnet-legacy-tvOS vsdrops gist

View dotnet iOS-MacCatalayst API diff

• dotnet-macCatiOS vsdrops gist

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Pipeline on Agent XAMBOT-1044.Monterey'
Hash: b8eb53240bc7dca303be333832879daf9ce065f5

[vs-mobiletools-engineering-service2]

✅ [CI Build] Tests passed on VSTS: simulator tests iOS. ✅

Tests passed on VSTS: simulator tests iOS.

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🎉 All 148 tests passed 🎉

Pipeline on Agent XAMBOT-1094.Monterey'
Merge b8eb532 into 3322f33