Mitigate race condition when fetching folder contents storage

[joshenlim]

Resolves FE-1677

Context

We've got a report internally that the storage explorer occasionally shows an error "Failed to retrieve folder contents from ...: bucketId is required". This error stems from fetchFolderContents in the storage explorer store, and fetchFolderContents uses the internal state state.selectedBucket.id to call the request to fetch the contents

StorageExplorer.tsx has a a couple of useEffects - of which two of them have a tendency for a race condition, specifically:

• The useEffect for openBucket with bucket in the dependency array
• The useEffect for fetchFolderContents with itemSearchString in the array

Because of this - there's technically a chance of fetchFolderContents being triggered before openBucket was called, in which case state.selectedBucket wouldn't have been set just yet, and hence cause the error

Changes involved

• fetchFolderContents now accepts the an additional parameter bucketId rather than relying on the internal state of selectedBucket
• Within the useEffect for fetchFolderContents in the if block for STORAGE_VIEWS.COLUMNS, conditionally call fetchFolderContents if openedFolders.length is 0
• Added a hook useSelectedBucket so that the currently selected bucket can be accessed easily

To test

• Mainly just do a brief smoke test of the storage explorer, ensure that everything is behaving as per status quo (open bucket, open folders, etc)

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[alaister]

LGTM!

• Tested on preview