[Debugger] Save result of Symbol Path Parser
[Debugger] Save result of Symbol Path Parser

- Save result of Symbol path parser as this method can be invoked even
when there are no changes into the symbol stores configuration. As this
event is handled by the VS DebugEngine and therefore we have no control
on when this method is called, we decided for storing the result of the
last used path.

GitOrigin-RevId: b957e76c43fa35359a89aadc9d4de3daa2b2139d

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