fix: run tests in nested test directories

[idavidrein]

Fixes the issue where tests in nested directories were not being run by the test workflow.

This PR addresses the issue by removing the -maxdepth 2 constraint from the find command in the run_affected_tests script, allowing it to recursively search through all directories under the package directories, finding all test files regardless of how deeply they are nested.

Resolves stdlib-js#2096

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