Add TestExplorer hierarchy support

[fkpama]

Related to Issue: #1087

Demo repository: https://github.com/fkpama/NUnitTestExplorerDemo

[fkpama]

@dotnet-policy-service agree

[fkpama]

dotnet-policy-service agree

…

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[OsirisTerje]

Tests needed

[OsirisTerje]

@fkpama Did you see this?