Prepare 2.8.0rc4 (#13547)
Prepare 2.8.0rc4 (#13547)

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