[component-groups | UnavailableContent] - Rename props

[fhlavac]

Follow up to breaking change PR

We've renamed some UnavailableContent props to comply with its base component - PF EmptyState

rename
unavailableTitleText to titleText
unavailableBodyPreStatusLinkText to preLinkBodyText
unavailableBodyPostStatusLinkText to postLinkBodyText

Example:

<UnavailableContent unavailableTitleText='Sample title' unavailableBodyPreStatusLinkText='Sample' unavailableBodyPostStatusLinkText='Sample' />

becomes

<UnavailableContent titleText='Sample title' preLinkBodyText='Sample' postLinkBodyText='Sample' />

Required actions:

• Build codemod
• Build test
• Update readme with description & example