Add eng/sdl-tsa-vars.config for TSA integration (#6980)

* Initial plan

* Add eng/sdl-tsa-vars.config with TSA configuration

Co-authored-by: SamMonoRT <46026722+SamMonoRT@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: SamMonoRT <46026722+SamMonoRT@users.noreply.github.com>

Author: Copilot

eng/sdl-tsa-vars.config

@@ -0,0 +1,14 @@
+-SourceToolsList @("policheck","credscan")
+-ArtifactToolsList @("binskim")
+-TsaInstanceURL https://devdiv.visualstudio.com/
+-TsaProjectName DEVDIV
+-TsaNotificationEmail aspnetcore-build@microsoft.com
+-TsaCodebaseAdmin REDMOND\aspnetcore-build
+-TsaBugAreaPath "DevDiv\ASP.NET Core\Policy Violations"
+-TsaIterationPath DevDiv
+-TsaRepositoryName dotnetextensions
+-TsaCodebaseName dotnetextensions
+-TsaOnboard $True
+-TsaPublish $True
+-PoliCheckAdditionalRunConfigParams @("UserExclusionPath < $(Build.SourcesDirectory)/.config/PoliCheckExclusions.xml")
+-CrScanAdditionalRunConfigParams @("SuppressionsPath < $(Build.SourcesDirectory)/.config/CredScanSuppressions.json")