Don't propose code snippets inside comments

[fbricon]

Code snippets inside comments are fairly noisy (they get in the way of JBang directives). I don't think there's a valid reason to propose them there.

[jdneo]

They are static snippets defined here: https://github.com/redhat-developer/vscode-java/blob/master/snippets/java.json.

If we want to make them more context-aware, we might need to consider making them become server-side snippets - Maybe unregistered the client static snippets once server is ready.

[rgrunber]

Maybe we could re-use some of the work from eclipse/lsp4mp#338 ?

[datho7561]

If we are interested in doing this, I could look into it