[Outlook] (manifest) document unified manifest for newish features

[Rick-Kirkham]

Note to reviewers:

1. The changes won't be published until GA of unified manifest for Outlook, currently expected in late February.
2. When users create the initial project using the Outlook quickstart for unified manifest, they will be using the quickstart that is updated to assume that Yo Office has give an option to choose the script type and instructs readers to choose JavaScript..

[learn-build-service-prod]

Learn Build status updates of commit ffe4ab1:

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[learn-build-service-prod]

Learn Build status updates of commit a60381f:

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[learn-build-service-prod]

Learn Build status updates of commit 090e02c:

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[samantharamon]

Do we need to explicitly configure "pinnable" and "multiselect"? From what I understand, these features are automatically enabled when "supportsNoItemContext" is set to true.

[Rick-Kirkham]

It's not mandatory to include them when "supportsNoItemContext" is true, but since the default for "pinnable" and "multiselect" (when they are not present) is false, I think it is misleading/confusing to leave them out in circumstances where they are NOT going to have their default values.

[learn-build-service-prod]

Learn Build status updates of commit 358a9fa:

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[learn-build-service-prod]

Learn Build status updates of commit 70d4b39:

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[learn-build-service-prod]

Learn Build status updates of commit f2a1ca4:

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