fix(opener): allow open network share locations (#3343)

* fix(opener): allow open network share locations

* Clippy

* Move to a seperate file

* Add license header

* test(opener): add unit tests for shell_parent_path and absolute functions (#1)

* Keep `absolute` non pub in `windows_shell_path`

* Add change file

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Co-authored-by: Mark Gandolfo <mark@gandolfo.com.au>