cargo-pgrx: fix pg_regress path inconsistency #2137
Merged
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The 'cargo pgrx new' command was creating pg_regress directories at the project root (./pg_regress/), while 'cargo pgrx regress' expected them under the tests directory (./tests/pg_regress/). This inconsistency caused immediate failures when running regression tests on newly created projects.
Fix the path mismatch by updating 'cargo pgrx new' to create the pg_regress directory structure under tests/, aligning with where 'cargo pgrx regress' expects to find them. This follows Rust's convention of organizing test files in a tests/ directory.
Also update the documentation and the hooks example to use the consistent path structure.
Fixes: #2136 ("Inconsistencies in the pg_regress path")