feat: use rich-text in site alert and spaces, increase alert display time

[dianneweinthal]

Connected to APPS-2172 Connected to APPS-2169 Connected to APPS-2158

• replaces plain text with rich text for BlockSpaces and SiteNotificationAlert

• increases SiteNotificationAlert display time

• adjusts SiteNotificationAlert styling

• to-do: update stories with rich-text

[github-actions[bot]]

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[github-actions[bot]]

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[pghorpade]

:tada: This PR is included in version 2.31.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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