Provide a way to list dependant extensions

[fbricon]

The vscode-java extension has quite an ecosystem of other extensions on its own. When trying to uninstall it, it'll fail because 'Java Test Runner' extension depends on it for instance. But Also the Java debugger, Project Manager for Java, Tools for Microprofile, Quarkus Tools...
At the moment, there's no way to know which extensions should be uninstalled first. I suggest the Extension view adds a new tab that lists all those dependant extensions, to make it easier to identify what to uninstall (or simply understand the extent one extension's reach).

[rpwnage]

I‘d like to take care of this enhancement request together with #119243

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