ImportedProjectEvent is visible for build check if /bl is specified

[YuliiaKovalova]

Issue Description

ImportedProjectEvent is visible for build check if /bl is specified.
If no /bl, the events are not visible to BuildCheck.

Steps to Reproduce

Demo_secrets.zip
1.Unpack the project
2. Build the project using the latest msbuild
.\dotnet build C:\Users\ykovalova\ProjectWithSecrets\ProjectWithSecrets.csproj -check
3. No imported events are caught by the custom check
4. Build the project using the latest msbuild
.\dotnet build C:\Users\ykovalova\ProjectWithSecrets\ProjectWithSecrets.csproj -check /bl

Expected Behavior

ImportedProject events are visible to BuildCheck

Actual Behavior

only if /bl switch is specified, the custom check works.

Analysis

No response

Versions & Configurations

No response

[JanKrivanek]

The event needs to be added to BuildCheckForwardingLogger

[JanKrivanek]

> .\dotnet.exe build .\ProjectWithSecrets.csproj -check -restore
Restore complete (1.2s)
You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy
C:\test\imports\ProjectWithSecrets.csproj(15,27): error DU0203: Detected secret: CommonSecrets with value: 'UMe8Q~1Ly5d.K.bjFek.RTto_gfgf.gr.cp.gRTI'
C:\test\imports\ProjectWithSecrets.csproj(16,23): error DU0203: Detected secret: CommonSecrets with value: 'ghs_QhbXVlJpnmSLfnff31a8JvTcHq3tQf02oQdM'
C:\test\imports\ProjectWithSecrets.csproj(11,26): error DU0203: Detected secret: Username with value: 'jankrivanek'
  ProjectWithSecrets succeeded (3.0s) → bin\Debug\net9.0\ProjectWithSecrets.dll

Build failed with 3 error(s) in 7.0s