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Closes the side panel iframe. Note that side panel add-on state isn't retained
within Meet when the method is called. If the side panel iframe is opened
again, for instance using a call to
loadSidePanel,
the side panel iframe source URL is set to its original value from the
add-on manifest.
It's up to the add-on to persist any add-on state in the add-on backend
before this method is called.