Use role=application for blockly container #9666
Description
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Problem
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Request
core/inject.ts requires changes to ensure that the correct ARIA context is set up for the entire application. inject() needs to be updated to set the parent subContainer to use role APPLICATION to ensure that the full ARIA context and keyboard shortcuts behave exactly as defined in Blockly with no custom HTML or default navigation/keyboard shortcut overrides by the screen reader.
Alternatives considered
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Additional context
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