perf(pet-windows-registry): parallelize HKLM/HKCU walk and reuse cach… #1522

Job	Run time
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	4m 7s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	9m 37s
Builds (windows-latest, aarch64-pc-windows-msvc)	5m 14s
Builds (macos-latest, x86_64-apple-darwin, yes)	3m 29s
Builds (macos-14, aarch64-apple-darwin, yes)	2m 20s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 45s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 20s
Tests (macos-14, aarch64-apple-darwin, yes)	10m 51s
Tests (macos-latest, x86_64-apple-darwin, yes)	15m 57s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 56s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 59s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	7m 16s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	6m 15s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	3m 0s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	6m 6s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	3m 6s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	6m 50s
	1h 39m 8s

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