Show path label on diff editors when other file with same name but different path is open

[goldst]

@bpasero implemented a path label for diff editors as discussed in #110694:

I found the following edge case in which the label doesn't work as expected and was asked to treat this as a separate issue:

Here, there are two different workbenchTestServices.ts files opened, one in .../common and one in .../browser, but only one of them is in a diff. I think both tabs should have a label here, because they would if both of them were a normal tab.

With other words: when two files with the same name but different paths are opened, I would expect both tabs to have a label with their respective path, even when one of the files is opened in diff.

[VSCodeTriageBot]

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