[Outlook] (preview) Added the closeAsync API

[samantharamon]

Related PR: DefinitelyTyped/DefinitelyTyped#65200

[learn-build-service-prod]

Learn Build status updates of commit 2f2830c:

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docs/requirement-sets/outlook/preview-requirement-set/outlook-requirement-set-preview.md	✅Succeeded	View (>=common-js || >=outlook-js-1.1 || >=excel-js-1.1 || onenote-js-1.1 || >=powerpoint-js-1.1 || visio-js-1.1 || >=word-js-1.1)

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[learn-build-service-prod]

Learn Build status updates of commit 7ee92be:

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docs/requirement-sets/outlook/preview-requirement-set/office.context.mailbox.item.md	✅Succeeded	View (>=common-js || >=outlook-js-1.1 || >=excel-js-1.1 || onenote-js-1.1 || >=powerpoint-js-1.1 || visio-js-1.1 || >=word-js-1.1)
docs/requirement-sets/outlook/preview-requirement-set/outlook-requirement-set-preview.md	✅Succeeded	View (>=common-js || >=outlook-js-1.1 || >=excel-js-1.1 || onenote-js-1.1 || >=powerpoint-js-1.1 || visio-js-1.1 || >=word-js-1.1)

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[learn-build-service-prod]

Learn Build status updates of commit c9e63d1:

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docs/requirement-sets/outlook/preview-requirement-set/office.context.mailbox.item.md	✅Succeeded	View (>=common-js || >=outlook-js-1.1 || >=excel-js-1.1 || onenote-js-1.1 || >=powerpoint-js-1.1 || visio-js-1.1 || >=word-js-1.1)
docs/requirement-sets/outlook/preview-requirement-set/outlook-requirement-set-preview.md	✅Succeeded	View (>=common-js || >=outlook-js-1.1 || >=excel-js-1.1 || onenote-js-1.1 || >=powerpoint-js-1.1 || visio-js-1.1 || >=word-js-1.1)

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