fix(snack-bar): set appropriate role based on passed in politeness #13864
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Currently we always have a
role
ofalert
on the snack bar container which has an implicit politeness ofassertive
and which can override the message announced by the live announcer. These changes set the role tostatus
if it's set topolite
or remove the role completely if the politeness is turned off.Fixes #13493.