Delete the archipelago_tester package

Left behind by the rename to apworld_tester: the new package was added
but the old tree was never removed, so both were committed and both
were installed. Nothing imported it and 58 of its 85 files had since
diverged, but it stayed importable and shadowed the live code.

Constrain packages.find to apworld_tester* so a stray directory under
src/ cannot be packaged again.

pyproject.toml

@@ -21,6 +21,7 @@ apworld-tester = "apworld_tester.cli:main"
 
 [tool.setuptools.packages.find]
 where = ["src"]
+include = ["apworld_tester*"]
 
 [tool.setuptools.package-data]
 apworld_tester = [