[Vue] add lazyInitSingleton function to lazily initialize singleton stores #18656
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Description:
Stores are singletons that can fetch data upon construction. This is helpful since it means components that use them don't have to manually initiate the fetch. However doing it this way can mean a lot of unneeded AJAX requests. The lazyInitSingleton function initializes a singleton upon first use so we only issue the AJAX requests when a store is used, without requiring components manually initialize them.
This is used in some of the sites manager PRs and some upcoming tag manager PRs.
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