Move +classNameWithoutNamespaces to WordPressSharedObjC

[mokagio]

I've been trying to move the Core Data model to WordPressData but got bogged with an NSArray element failed to match the Swift Array Element type exception — More details in #24166.

Given that work is still in progress, I thought we could at least merge this pre-condition change to move (actually duplicate for migration convenience) the classNameWithoutNamespaces method on NSObject that the models use to create their NSFetchRequest.

WordPress-iOS/WordPress/Classes/Models/BloggingPrompt+CoreDataClass.swift

Lines 5 to 9 in 85215d2

	public class BloggingPrompt: NSManagedObject {
	@nonobjc public class func fetchRequest() -> NSFetchRequest<BloggingPrompt> {
	return NSFetchRequest<BloggingPrompt>(entityName: Self.classNameWithoutNamespaces())
	}

[dangermattic]

	1 Warning
⚠️	Modules/Package.swift was changed without updating its corresponding Package.resolved. Please resolve the Swift packages as appropriate to your project setup (e.g. in Xcode or by running swift package resolve).

Generated by 🚫 Danger

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[kean]

Hey Gio, did you mean to base it off trunk? It seems to include other changes.

[kean]

Going to approve it to make it mergable once the commit history is updated.

[mokagio]

@kean this was stacked on top of #24153 but the squash and merge of that into trunk messed up the history here

I'll rebase and we should be good. Thanks for the preemptive approval.