Add test for banner skip in server mode

[Copilot]

Add regression test to verify the banner is not displayed when running in server mode, per issue #6888 comment.

Changes

• Added RunningInServerMode_BannerIsSkipped() test in ServerLoggingTests.cs
• Test validates that logs collected during server mode execution do not contain the banner pattern Microsoft\.Testing\.Platform v.+ \[.+\]
• Leverages existing ServerModeTestsBase infrastructure and test assets

The test ensures the behavior in TerminalOutputDevice.cs:209 (if (!_bannerDisplayed && !_isServerMode)) is preserved.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• l49vsblobprodcus358.vsblob.vsassets.io
  • Triggering command: /home/REDACTED/work/testfx/testfx/.dotnet/dotnet /home/REDACTED/work/testfx/testfx/.dotnet/dotnet msbuild /m /nologo /clp:Summary /v:minimal /nr:true /warnaserror /p:TreatWarningsAsErrors=true /p:ContinuousIntegrationBuild=false /home/REDACTED/work/testfx/testfx/artifacts/toolset/restore.proj /t:__WriteToolsetLocation /clp:ErrorsOnly;NoSummary /p:__ToolsetLocationOutputFile=/home/REDACTED/work/testfx/testfx/artifacts/toolset/11.0.0-beta.25615.1.txt (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add test for banner being skipped in server mode</issue_title>
<issue_description>> @nohwnd @Youssef1313 let's try to consider adding a test that would prevent regression (doesn't have to be done right away if you are in rush with some release).

Originally posted by @Evangelink in #6888 (comment)
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add test for banner being skipped in server mode #6893

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