Page - Penta updates

[thatblindgeye]

Follow up to breaking change PR patternfly/patternfly-react#9848 and patternfly/patternfly-react#9774

Added a new option to the variant prop, and updated so the class from the variant prop will only be applied when type="default" (previously a class would always be applied)

PageSidebar: Removed Page sidebar theme prop since it only supports the default theme.
PageSection: Removed light, dark and `darker variant since the are no longer supported.
PageHeader (deprecated): removed isSelected prop since it is no longer supported in Page

Required actions:

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