fix: Refactor date time for flexible_Banner* components and Fix category null display in BlockHighlight

[aprigge]

Connected to APPS-2021 and APPS-2009

Flexible Banner Featured https://deploy-preview-312--ucla-library-storybook.netlify.app/?path=/story/flexible-banner-featured--event Flexible Card With Image https://deploy-preview-312--ucla-library-storybook.netlify.app/?path=/story/flexible-card-with-image--event-exhibiton-article Flexible Highlight https://deploy-preview-312--ucla-library-storybook.netlify.app/?path=/story/flexible-highlight--event-exhibiton-article

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[pghorpade]

:tada: This PR is included in version 2.27.7 :tada:

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