[internal] Replace deprecated use of `[pytest] junit_xml_dir` with `[test] xml_dir. (#13069)
[internal] Replace deprecated use of `[pytest] junit_xml_dir` with `[test] xml_dir. (#13069)

[ci skip-rust]
[ci skip-build-wheels]
pantsbuild/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,benjyw/pants,benjyw/pants