[lldb] Make semantics of SupportFile equivalence explicit (#97126)

This is an improved attempt to improve the semantics of SupportFile
equivalence, taking into account the feedback from #95606.

[lldb] Make semantics of SupportFile equivalence explicit (#97126)

This is an improved attempt to improve the semantics of SupportFile
equivalence, taking into account the feedback from #95606.

Pavel's comment about the lack of a concise name because the concept
isn't trivial made me realize that I don't want to abstract this concept
away behind a helper function. Instead, I opted for a rather verbose
enum that forces the caller to consider exactly what kind of comparison
is appropriate for every call.

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