Use GitHub workspace paths in perf workflow #6210

Job	Run time
Format (Cargo)	17s
Lint (Biome)	14s
Typecheck	1m 37s
Detect Changes	8s
Format (Biome)	8s
Rust cache (x86_64-pc-windows-msvc, windows-latest)	23m 47s
Rust cache (x86_64-apple-darwin, macos-latest)	2m 46s
Rust cache (aarch64-apple-darwin, macos-latest)	23m 27s
Clippy (x86_64-pc-windows-msvc, windows-latest)	8m 8s
Clippy (aarch64-apple-darwin, macos-latest)	4m 40s
Verify Tauri plugin versions	-1s
Build Desktop	-1s
	1h 5m 10s

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