Miscellaneous R2RDump improvements (#23215)

Miscellaneous R2RDump improvements (#23215)

1) In Naked mode, hide the distinction amongst METHOD_ENTRY vs.
METHOD_ENTRY_REF_TOKEN vs. METHOD_ENTRY_DEF_TOKEN as it's not
important for correctness and causes undesirable churn in diffs.
This required propagating the DumpOptions around in a couple
of places.

2) For historical reasons, the DisassemblingTypeProvider had
its own implementations of metadata formatting that is now provided
by MetadataNameFormatter. I have removed at least a part of this
duplication in this change. [It was causing undesirable diffs as
one version used to output type owner assemblies whereas the other
did not.]

Thanks

Tomas