HelperText - Penta updates

[thatblindgeye]

Follow up to breaking change PR:

• feat(HelperText): consumed Penta updates patternfly-react#10029
  • removed hasIcon prop; icons will render automatically when variant !== "default", or when icon is passed
  • removed isDynamic prop; this no longer serves any purpose
  • the screenReaderText prop is now based on the variant prop not being "default" (previously was based on the isDynamic prop being true)

Required actions:

1. Build codemod
2. Build test
3. Update readme with description & example