Fix creating interface for functions with upper bounded polymorphic args

[mediremi]

Closes #7443

I think the problem of the extra large being included in the interface came from the polymorphic variant's constraints labels being printed (if I'm correctly understanding the purpose of the last value in Otyp_variant).

While the removed code may have been needed for OCaml/Reason syntax, I couldn't find any valid ReScript polymorphic variant syntax that required variant labels/tags to be printed.

[mediremi]

Are there any cases when we do want to print out the variant's labels/tags?

The code just above mentions syntax like [< #A | #B > #X #Y ], but this doesn't seem to be valid ReScript:

rescript/compiler/syntax/src/res_outcome_printer.ml

Lines 104 to 116 in cfcd99b

	let opening =
	match (closed, labels) with
	| true, None -> (* [#A | #B] *) Doc.soft_line
	| false, None ->
	(* [> #A | #B] *)
	Doc.concat [Doc.greater_than; Doc.line]
	| true, Some [] ->
	(* [< #A | #B] *)
	Doc.concat [Doc.less_than; Doc.line]
	| true, Some _ ->
	(* [< #A | #B > #X #Y ] *)
	Doc.concat [Doc.less_than; Doc.line]
	| false, Some _ ->

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commit: 02f5001