fix(auth): Setting Store Tokens should only clear tokens that no longer have a value (#13584)

* Setting Store Tokens should only clear tokens that no longer have a value.  This resolves thrashing events when a consumer is listening to storage events, preventing them from seeing a 'clear' followed immediatly by a 'set' value.

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Co-authored-by: AllanZhengYP <[email protected]>
Co-authored-by: Joon Choi <[email protected]>
Co-authored-by: Hui Zhao <[email protected]>

Author: 4 people