[EuiComboBox] Revising to WAI-ARIA 1.2 spec.#5636

Merged

1Copenut merged 10 commits intoelastic:mainfrom

1Copenut:feature/tpierce-eui-5301-combobox

Feb 23, 2022

Commits on Feb 14, 2022

Revising EuiCombobox to WAI-ARIA 1.2 spec.
1Copenut
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Commits on Feb 18, 2022

Added aria-autocomplete, aria-label to combo box."
1Copenut
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Adding changelog entry for PR 5636.
1Copenut
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Upstream merge from main.
1Copenut
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Commits on Feb 22, 2022

Refactoring the i18n to a smaller footprint.
1Copenut
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Merging upstream/main
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Adjusting comments for better clarity.
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Commits on Feb 23, 2022

Merge branch 'main' into feature/tpierce-eui-5301-combobox
1Copenut
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Pulling latest and moving entry to main group.
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Merging main one more time before shipping.
1Copenut
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