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py3: fully fix bundlepart.__repr__ to return str not bytes

Authored by spectral.

Description

py3: fully fix bundlepart.repr to return str not bytes

My previous fix did not fully fix the issue: it would attempt to use
%-formatting to combine two strs into a bytes, which won't work. Let's just
switch the entire function to operating in strs. This can cause a small output
difference that will likely not be noticed since no one noticed that the method
wasn't working at all before: if id or type are not-None, they'll be shown
as b'val' instead of val. Since this is a debugging aid and these strings
shouldn't be shown to the user, slightly rough output is most likely fine and
it's likely not worthwhile to add the necessary conditionals to marginally
improve it.

Differential Revision: https://phab.mercurial-scm.org/D8091