Update branding to 3.1.1

[wtgodbe]

Update branding & add trigger for internal release/3 branches

@JunTaoLuo @mmitche PTAL

[wtgodbe]

This will probably fail until we get #17311 in & merge it to 3.1

[wtgodbe]

Template failures:

Project new angular --auth Individual failed to publish.\r\nProcess exited with code 1\nStdErr: \nStdOut: Microsoft (R) Build Engine version 16.4.0-preview-19475-01+497296502 for .NET Core\r\nCopyright (C) Microsoft Corporation. All rights reserved.\r\n\r\nF:\workspace.16_work\1\s.dotnet\sdk\3.1.100-preview1-014400\MSBuild.dll -maxcpucount -property:Configuration=Release -restore -target:Publish -verbosity:m /bl .\AspNet.angularindividual.oueksvxrynk.csproj\r\n Restore completed in 23.26 ms for F:\workspace.16_work\1\s\src\ProjectTemplates\test\bin\Release\netcoreapp3.1\TestTemplates\AspNet.angularindividual.oueksvxrynk\AspNet.angularindividual.oueksvxrynk.csproj.\r\n You are using a preview version of .NET Core. See: https://aka.ms/dotnet-core-preview\r\nF:\workspace.16\_work\1\s\.dotnet\sdk\3.1.100-preview1-014400\Microsoft.Common.CurrentVersion.targets(2106,5): warning MSB3106: Assembly strong name "F:\workspace.16_work\1\s\obj\template-restore\microsoft.aspnetcore.app.ref\3.0.0\ref\netcoreapp3.1\Microsoft.AspNetCore.Antiforgery.dll" is either a path which could not be found or it is a full assembly name which is badly formed. If it is a full assembly name it may contain characters that need to be escaped with backslash(). Those characters are Equals(=), Comma(,), Quote("), Apostrophe('), Backslash(). [F:\workspace.16_work\1\s\src\ProjectTemplates\test\bin\Release\netcoreapp3.1\TestTemplates\AspNet.angularindividual.oueksvxrynk\AspNet.angularindividual.oueksvxrynk.csproj]\r\nF:\workspace.16_work\1\s.dotnet\sdk\3.1.100-preview1-014400\Microsoft.Common.CurrentVersion.targets(2106,5): warning MSB3106: Assembly strong name "F:\workspace.16_work\1\s\obj\template-restore\microsoft.aspnetcore.app.ref\3.0.0\ref\netcoreapp3.1\Microsoft.AspNetCore.Authentication.Abstractions.dll" is either a path which could not be found or it is a full assembly name which is badly formed. If it is a full assembly name it may contain characters that need to be escaped with backslash(). Those characters are Equals(=), Comma(,), Quote("), Apostrophe('), Backslash(). [F:\workspace.16_work\1\s\src\ProjectTemplates\test\bin\Release\netcoreapp3.1\TestTemplates\AspNet.angularindividual.oueksvxrynk\AspNet.angularindividual.oueksvxrynk.csproj]\r\nF:\workspace.16_work\1\s.dotnet\sdk\3.1.100-preview1-014400\Microsoft.Common.CurrentVersion.targets(2106,5): warning MSB3106: Assembly strong name "F:\workspace.16_work\1\s\obj\template-restore\microsoft.aspnetcore.app.ref\3.0.0\ref\netcoreapp3.1\Microsoft.AspNetCore.Authentication.Cookies.dll" is either a path which could not be found or it is a full assembly name which is badly formed. If it is a full assembly name it may contain characters that need to be escaped with backslash(). Those characters are Equals(=), Comma(,), Quote("), Apostrophe('), Backslash(). [F:\workspace.16_work\1\s\src\ProjectTemplates\test\bin\Release\netcoreapp3.1\TestTemplates\AspNet.angularindividual.oueksvxrynk\AspNet.angularindividual.oueksvxrynk.csproj]\r\nF:\workspace.16_work\1\s.dotnet\sdk\3.1.100-preview1-014400\Microsoft.Common.CurrentVersion.targets(2106,5): warning MSB3106: Assembly strong name "F:\workspace.16_work\1\s\obj\template-restore\microsoft.aspnetcore.app.ref\3.0.0\ref\netcoreapp3.1\Microsoft.AspNetCore.Authentication.Core.dll" is either a path which could not be found or it is a full assembly name which is badly formed. If it is a full assembly name it may contain characters that need to be escaped with backslash(). Those characters are Equals(=), Comma(,), Quote("), Apostrophe('), Backslash(). [F:\workspace.16_work\1\s\src\ProjectTemplates\test\bin\Release\netcoreapp3.1\TestTemplates\AspNet.angularindividual.oueksvxrynk\AspNet.angularindividual.oueksvxrynk.csproj]\r\nF:\workspace.16_work\1\s.dotnet\sdk\3.1.100-previe

[wtgodbe]

Others are PlatformManifestListsAllFiles and AssembliesAreReferenceAssemblies, which I think we fixed in 3.0. Looking

[wtgodbe]

Oh, we need to update the baseline.

[wtgodbe]

This will fail at least until dotnet-install.sh gets fixed