Allow user to select TensorBoard plugin missing profiler source files using file picker #15993
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For #15695
Currently if a jump to source request from the TensorBoard profiler plugin in VS Code fails, there's no indication to the user of what the problem is. This PR adds a quickpick to ask the user to manually specify the source files on disk, and resolves the jump to source request against the user's selected file instead.
We're using a quickpick instead of a prompt because prompts are often ignored--hopefully the user will be less likely to ignore this and get confused about the feature not working.
Screenshot:
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GIF:
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