MatMenu aria-label is not cleared from dummy element

[jelbourn]

<mat-menu> is a dummy element whose content is extracted and rendered into an overlay. We forward aria-label to the real menu, but we currently don't clear this label from the dummy element, leading to it being ready by screen-readers. We should do one of:

• Clear the forwarded attributes
• Add aria-hidden
• Just completely remove the dummy element from the DOM

Until this is fixed, people can work around the issue by using a binding, e.g. [aria-label]="'Settings menu'"

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