refactor: remove default prop usage across components

[matthewgallo]

This is part of https://github.com/carbon-design-system/carbon-for-products-website/issues/360

We've been noticing lots of console errors, this contributes towards some specifically related to defaultProp usage, and it no longer being supported.

Changelog

Changed

packages/gatsby-theme-carbon/src/components/ArticleCard/ArticleCard.js
packages/gatsby-theme-carbon/src/components/AutolinkHeader/AutolinkHeader.js
packages/gatsby-theme-carbon/src/components/DoDontRow/DoDont.js
packages/gatsby-theme-carbon/src/components/FeatureCard/FeatureCard.js
packages/gatsby-theme-carbon/src/components/Footer/Footer.js
packages/gatsby-theme-carbon/src/components/GifPlayer/GifPlayer.js
packages/gatsby-theme-carbon/src/components/Grid/Grid.js
packages/gatsby-theme-carbon/src/components/Header/Header.js
packages/gatsby-theme-carbon/src/components/Homepage/Callout.js
packages/gatsby-theme-carbon/src/components/ImageCard/ImageCard.js
packages/gatsby-theme-carbon/src/components/ResourceCard/ResourceCard.js
packages/gatsby-theme-carbon/src/components/SquareCard/SquareCard.js
packages/gatsby-theme-carbon/src/components/Switcher/Switcher.js
packages/gatsby-theme-carbon/src/components/Video/Video.js

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[alisonjoseph]

Nice, thanks for updating this!

[tay1orjones]

Looks fine but I'm not sure the defaults need stable references that live outside the function definition unless they're functions. carbon-design-system/carbon#10777