Stabilize `build-dir` layout v2 #16807

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ranger-ross wants to merge 9 commits intorust-lang:masterfrom

ranger-ross:stablize-build-dir-new-layout

Commits on Apr 17, 2026

test: Added test for __CARGO_TEMPORARY_BUILD_DIR_NEW_LAYOUT_OPT_OUT
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feat: Added __CARGO_TEMPORARY_BUILD_DIR_NEW_LAYOUT_OPT_OUT to opt out of new layout
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doc: Updated build_dir test documentation
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test: Split fine-grain-locking tests into dedicated file
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test: Rename testsuite/clean.rs to testsuite/clean_legacy_layout.rs
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test: Rename testsuite/clean_new_layout.rs to testsuite/clean.rs
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test: Added __CARGO_TEMPORARY_BUILD_DIR_NEW_LAYOUT_OPT_OUT to opt out legacy layout clean tests
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test: Prevent 2 letter crate names from being merged into [HASH] in redactions
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feat: Stablize build-dir layout v2
ranger-ross
committed