return RewriteResult for rewrite_path & rewrite_struct_***

[ding-young]

Tracked by #6206

Description

Modify following functions to return RewriteResult

• rewrite_path and its caller (rewrite_struct_lit / pat)
• method rewrite_aligned_item of AlignedItem trait

Impl rewrite_result for PreciseCapturingArg, AssocItemConstraint, PolyTraitRef, TraitRef in types.rs
(These are the nodes that were waiting for certain rewrite_*** to return RewriteResult. see #6220)

Side notes

• rewrite_prefix, another method of the AlignedItem trait remains Option<String> since it is used for the possible range of width for struct prefix (see struct_field_prefix_max_min_width)
• Additionally, there are some messy unknown_error() calls since I haven't modified write_list, itemize_list, and similar functions. There's ongoing concern about modifying these functions and the iterator implementation for ListItems.

[ytmimi]

Thanks for another PR. This one is next on my todo list

[ytmimi]

I think we're good to go on this one. We just need to address the merge conflict

[ytmimi]

Running the Diff-Check Job now

Edit: The job passed ✅

[calebcartwright]

Just noting that this broader change (not specifically this PR, but the overall mission of #6206, has a higher chance of causing merge conflicts on the subtree syncs so if possible it would be good to try to get some more frequent syncs through

[ding-young]

@calebcartwright Thanks for pointing that out. I'll try to follow your advice :)

[calebcartwright]

@calebcartwright Thanks for pointing that out. I'll try to follow your advice :)

nothing for you to worry about @ding-young, it was mostly a note to myself & Yacin to try to get these in more frequently

[ytmimi]

@calebcartwright good call out. I don't think there's been many changes in r-l/rust recently, but I can certainly look to get subtree-push PRs out weekly or bi-weekly to keep up with the changes here.