Fix presented provider backend for rules/subsystems. (#14999)
Fix presented provider backend for rules/subsystems. (#14999)

Closes 14940.

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