Please backport .swiftinterface fixes to 6.2

[Wilfred]

Swift version

Swift 6.2

Platform

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Editor

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Description

#1887 changed OpenInterface.swift as follows:

let urlData = GeneratedInterfaceDocumentURLData(
  moduleName: moduleName,
  groupName: groupName,
  sourcekitdDocumentName: "\(moduleName)-\(UUID())",
  primaryFile: document
)

Since GeneratedInterfaceDocumentURLData implements Hashable and hence Equatable, each request is unique. As a result, we never get any cache hits in GeneratedInterfaceManager.swift:

guard let cachedIndex = openInterfaces.firstIndex(where: { $0.url == document }) else {
  return nil
}

This makes .swiftinterface requests noticeably slower in my usage.

This was subsequently fixed in #2233, but that's only in Swift 6.3. Could we backport that PR to 6.2? The commits apply cleanly to 6.2 too.

Steps to Reproduce

Open any Swift file with import Foundation and attempt a go-to-def (F12) on Foundation repeatedly. Observe that the

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