Reduce Build warnings to zero

[wtgodbe]

Using this as a tracking issue to get our repo down to zero recurring build warnings, so that we can turn on /warnaserror. Most common warnings are ranked below

Count	Warning	Notes	Issue
600+	Atleast for one assembly start time was not obtained due to tag not present or parsing issue, total run duration will now be summation of time taken by each assembly	Happens while publishing quarantined test results	#22241
120+	Could not parse Jtokens from F:\workspace_work\1\s\artifacts\tmp\Release\ContainerSigning\2455\content\ReactRedux-CSharp\ClientApp\package-lock.json file.	Happens during Component Detection	#22243
28+	CS8632: The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.	Happens in all regular build steps	#22389
27	warning MSB4011: "F:\workspace_work\1\s.packages\microsoft.dotnet.arcade.sdk\5.0.0-beta.20261.9\tools\BuildTasks.props" cannot be imported again.	Happens in most build steps	#22244
21	Component Governance detected 5 security related alerts at or above 'High' severity.	Happens during Component Detection	#22252
18	in asset size limit: The following asset(s) exceed the recommended size limit (244 KiB).	Happens in the 6 main build jobs	#22390
10	Converting null literal or possible null value to non-nullable type.	Happens in the 6 main build jobs	#22733
9	Executable bit is not set on target script, sourcing instead of executing.	Happens during Setup Private Feed Credentials	#22245
4	Microsoft.Common.CurrentVersion.targets(778,5): warning : The OutputPath property is not set for project 'helix.proj'.	Happens during Test Helix x64	#22246
2	warning NU5119: File 'F:\workspace_work\1\s\artifacts\obj\RedistSharedFx.Layout\Release\win-x64\shared\Microsoft.AspNetCore.App\5.0.0-preview.6.20275.3.version' was not added to the package.	Happens during SiteExtension build	#22247
2	warning NU5118: File 'Microsoft.AspNetCore.AzureAppServices.HostingStartup.deps.json' is not added because the package already contains file 'Microsoft.AspNetCore.AzureAppServices.HostingStartup.deps.json'	Happens during SiteExtension build	#22248
2	unknown substitution variable ${shlibs:Depends}	Happens during Linux x64 Debian Installer build	#22249
1	warning : This project has native dependencies which were not built. [F:\workspace_work\1\s\src\SiteExtensions\Runtime\Microsoft.AspNetCore.Runtime.SiteExtension.pkgproj]	Happens during SiteExtension build	#22250
1	E2ETesting.targets(23,5): warning : Waiting for the other yarn instance to finish (7228) [F:\workspace_work\1\s\src\ProjectTemplates\BlazorTemplates.Tests\BlazorTemplates.Tests.csproj]	Happens during Windows Template Tests	#22251

• Fix warning "Atleast for one assembly start time was not obtained due to tag not present or parsing issue" #22241
• Fix warning "Could not parse Jtokens from ...package-lock.json file." #22243
• Fix warning "7 warning MSB4011: "F:\workspace_work\1\s.packages\microsoft.dotnet.arcade.sdk\5.0.0-beta.20261.9\tools\BuildTasks.props" cannot be imported again." #22244
• Fix warning 'Executable bit is not set on target script, sourcing instead of executing.' #22245
• Fix warning "The OutputPath property is not set for project 'helix.proj'." #22246
• Fix warning "File 'F:\workspace_work\1\s\artifacts\obj\RedistSharedFx.Layout\Release\win-x64\shared\Microsoft.AspNetCore.App\5.0.0-preview.6.20275.3.version' was not added to the package." #22247
• Fix warning " warning NU5118: File 'Microsoft.AspNetCore.AzureAppServices.HostingStartup.deps.json' is not added because the package already contains file 'Microsoft.AspNetCore.AzureAppServices.HostingStartup.deps.json'" #22248
• Fix warning "unknown substitution variable ${shlibs:Depends}" #22249
• Fix warning "warning : This project has native dependencies which were not built. [F:\workspace_work\1\s\src\SiteExtensions\Runtime\Microsoft.AspNetCore.Runtime.SiteExtension.pkgproj]" #22250
• Fix warning "Waiting for the other yarn instance to finish" #22251
• Fix warning "Component Governance detected 5 security related alerts at or above 'High' severity." #22252
• Fix warning: "CS8632: The annotation for nullable reference types should only be used in code within a '#nullable' annotations context." #22389
• Fix warning: "in asset size limit: The following asset(s) exceed the recommended size limit (244 KiB)." #22390
• Fix warning: "CS0618: 'RelationalIndexBuilderExtensions.HasName(IndexBuilder, string)' is obsolete" #22630
• Fix warning "LNK4075: ignoring '/EDITANDCONTINUE' due to '/SAFESEH' specification" #22632
• Fix warning "warning MSB3026: Could not copy "F:\workspace\_work\1\s\.packages\..." #22635
• Fix warning "##[warning]SetCookieHeaderValueTest.cs(423,67): warning CS8600: (NETCORE_ENGINEERING_TELEMETRY=Build) Converting null literal or possible null value to non-nullable type." #22733
• Fix nullable warnings when building test code #22992

[dougbu]

If we're going to use this to track project, suggest adding a checklist to the original description. If not, I'm unsure we need this issue in addition to the per-category ones.

[wtgodbe]

@dougbu I wanted to do that originally, but couldn't think of a good way to combine that with the info in the table - any suggestions? I'd be fine removing the descriptions but I'd at least want this issue to have the counts, links to the issues, and checkboxes

[dougbu]

Maybe just add a bunch 'o - [ ] {PR link} lines below the table?