Discuss the handling of RunSettingsFilePath in new dotnet test experience

[Youssef1313]

Copy from microsoft/testfx#5199

Currently, the implementation of the new dotnet test experience for .NET 10 will set TESTINGPLATFORM_VSTESTBRIDGE_RUNSETTINGS_FILE environment variable.

This doesn't seem ideal. What if we considered a breaking change for the env variable name in our next major? Or even remove the env variable support completely?

Should we instead pass runsettings via --settings command line option, which is much less likely that we will want to break?

cc @mariam-abdulla

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Comment by @Youssef1313

Actually there was some discussion before (microsoft/testfx#4636) where @nohwnd and @Evangelink thought that this property shouldn't be supported in MTP.

[Youssef1313]

This should be handled on VSTestBridge via RunArguments. SDK shouldn't be aware of this for MTP.