fix: Resolve target-dir more precisely
#20920
Open
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Fixes #20821
Currently, there are some buggy situations:
rust-analyzer.cargo.targetDiris set tonull, flycheck output files are written to thetarget/, even iftarget-diris set otherwise either with env vars or config files.rust-analyzer.cargo.targetDiris set totrue, and$CARGO_TARGET_DIRis unset, rust-analyzer's flycheck artifacts are written intarget/rust-analyzer, even if thetarget-diris set otherwise either with$CARGO_BUILD_TARGET_DIRor cargo config file.