RS1019 does not analyze suppression descriptions

I just noticed that suppression descriptors are not analyzed by RS1019 etc (https://github.com/dotnet/roslyn/blob/241d91b57703f837cc3e02c1c0b49f7383efde5d/src/RoslynAnalyzers/Microsoft.CodeAnalysis.Analyzers/Core/MetaAnalyzers/DiagnosticDescriptorCreationAnalyzer.cs).
I suspect that all descriptor ids should be unique, regardless of if they are used by analyzers or suppressors?

Start by reading src/RoslynAnalyzers/Microsoft.CodeAnalysis.Analyzers/Core/MetaAnalyzers/DiagnosticDescriptorCreationAnalyzer.cs and trace how RS1019 handles descriptors used by suppressors. Determine the expected uniqueness and analysis behavior for suppression descriptors, then verify the change with the relevant analyzer tests; done means those descriptors are analyzed consistently with analyzer descriptors.

Written by the indexing model from the issue text.