Merge #8595

8595: Diagnostic paths support specifying `remapPrefix` r=rickvanprim a=rickvanprim

Currently VSCode Problem Matchers will resolve a path like `//foo_crate/src/main.rs` if `${workspaceFolder}/foo_crate/src/main.rs` exists.  Presumably their behavior is functionally a string concatenation that would produce `${workspaceFolder///foo_crate/src/main.rs` and repeated path separators get ignored.

This PR attempts to mimic this behavior by stripping any `Component::RootDir` from `file_name` before joining it to `workspace_root`, and then checking if the file exists.  If it does, this path is used, and if not, the behavior falls through to the existing Rust path join behavior.

Co-authored-by: James Leitch <[email protected]>

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