Use IEventListener to register workspaces for LSP instead of inside AbstractPackage #50387
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Per @jasonmalinowski AbstractPackage initialization is only used for certain initialization paths (e.g. tools options, object browser, old project system com bits). In general other roslyn initialization is done via MEF and does not go through the UI thread bound package initialization.
So instead of registering workspaces in the package load (which doesn't match 1:1 with workspace creation) we instead register the workspaces exactly when they are created via the IEventListener infrastructure.
Fixes #50386