[internal] remove the instance name option from config (#16026)
[internal] remove the instance name option from config (#16026)

This is not the actual value that is being used.
the toolchain auth plugin provides that value to pants.
benjyw/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,pantsbuild/pants,pantsbuild/pants