Deadlock playground: disable top-level system exec parallelism #7448

Job	Run time
cpp-paths-filter	6s
Build & Upload rerun_c (Linux x64) / Set Config (linux)	3s
Build JS / Build	6m 24s
Build & Upload rerun-cli (Linux x64) / Set Config (linux)	1s
Build Web / Build Web (wasm32 + wasm-bindgen)	6m 20s
Checks / C++ formatting check	3m 19s
Checks / Misc formatting	22s
Checks / Rerun lints	3m 7s
Checks / Check if running codegen would produce any changes	2m 9s
Checks / Python lints (ruff, mypy, …)	5m 45s
Checks / Cargo Deny	2m 20s
Checks / Test Python Docs	27s
Checks / Check Rust web build (wasm32 + wasm-bindgen)	2m 55s
Checks / Spell Check	4s
Checks / Rust lints (fmt, check, cranky, tests, doc)	16m 11s
Checks / Lint TOML files	14s
Minimum Wheel Build / Set Config (linux)	2s
Update PR Body / Update PR body	1m 56s
Build & Upload rerun-cli (Linux x64) / Build rerun-cli (ubuntu-latest-16-cores)	6m 36s
C++ tests / matrix_prep	3s
C++ tests / C++ build & test - Linux x64	2m 33s
Build & Upload rerun_c (Linux x64) / Build rerun_c (ubuntu-latest-16-cores)	2m 26s
Minimum Wheel Build / Build Wheels (ubuntu-latest-16-cores)	3m 38s
Bundle and upload rerun_cpp_sdk.zip / Bundle and upload rerun_cpp_sdk.zip	7m 58s
Run Notebook / Run notebook	2m 19s
Minimum Wheel Test / Set Config (linux)	1s
Build Examples / Build Examples	2m 20s
Minimum Wheel Test / Test Wheels (ubuntu-latest-16-cores)	9m 53s
Upload Web / Upload web build to google cloud (wasm32 + wasm-bindgen)	13s
Track Sizes / Track Sizes	44s
Upload Examples / Upload Examples to Google Cloud	26s
Save PR Summary / Create HTML summary for PR	29s
	1h 31m 24s

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