Add a `attr.rust.no_placeholder` attribute to codegen #12833

Job	Run time
cpp-paths-filter	5s
docs-paths-filter	6s
python-paths-filter	6s
rust-paths-filter	5s
web-paths-filter	5s
Checks / Check if running codegen would produce any changes	1m 15s
Checks / Rerun lints	32s
Checks / Lint markdown	17s
Checks / Spell Check	10s
Checks / Misc formatting	21s
Checks / Check links	19s
Update PR Body / Update PR body	23s
Build web viewer / Build web viewer	2m 11s
Build rerun_js / Build rerun_js	3m 22s
C++ tests	0s
Rust Checks / Rust lints (fmt, check, clippy, tests, doc)	6m 42s
Rust Checks / Test on macOS and Windows	0s
Python Checks	0s
Minimum CLI Build / Set Config (linux-x64)	1s
Deploy Landing Preview	0s
Minimum CLI Build / Build rerun-cli (ubuntu-latest-16-cores)	3m 34s
Upload Web / Upload web build to google cloud (wasm32 + wasm-bindgen)	8s
Save PR Summary / Create HTML summary for PR	41s
Minimum Wheel Build / Set Config (linux-x64)	2s
Minimum Wheel Build / Build Wheels (ubuntu-latest-16-cores)	2m 17s
Minimum Wheel Test / Set Config (linux-x64)	1s
Minimum Wheel Test / Test Wheels (ubuntu-latest-16-cores)	4m 11s
	26m 54s

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