fix spark-react test errors by adding react component proptype

[afebbraro]

What does this PR do?

We have been getting react test errors/warnings since the new docs site started. See below screenshot. I fixed this by researching and discovering a newer proptype that we should use going forward when we have a prop that can be of type react component. I left the old proptype values and added the new one. Leaving the old ones for now ensures that we don't have a breaking change. see: …facebook/prop-types#211 for more info

Associated Issue

Fixes #2238
This involves our react package and will be good to update that in the release notes when we launch that we added an additional proptype option of PropTypes.elementType to SprkLinks (element), SprkCardTeaser (ctaLinkElement, mediaLinkElement) and SprkMasthead (logoLinkElement).

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Documentation

• No documentation changes needed because proptype documentation in react is autogenerated in the SB apart of NDS and these changes are apart of that.

Code

• Build Component in Spark React
• Unit Testing in Spark React with gulp test-react (100% coverage, 100% passing)

Accessibility

• New changes abide by accessibility requirements

Browser Testing (current version and 1 prior)

• Google Chrome
• Google Chrome (Mobile)
• Mozilla Firefox
• Mozilla Firefox (Mobile)
• Microsoft Internet Explorer 11 (only this specific version of IE)
• Microsoft Edge
• Apple Safari
• Apple Safari (Mobile)