[Site Creation] Remaining TODO marks

[oguzkocer]

We have left some // TODOs in the code during the site creation project. We need to address them, so here is a list:

• SegmentsViewHolder icon URL and color issue: https://github.com/wordpress-mobile/WordPress-Android/blob/feature/master-site-creation/WordPress/src/main/java/org/wordpress/android/ui/sitecreation/segments/NewSiteCreationSegmentViewHolder.kt#L38-L39
• CreateSiteUseCaseTest API test issue: https://github.com/wordpress-mobile/WordPress-Android/blob/feature/master-site-creation/WordPress/src/test/java/org/wordpress/android/ui/sitecreation/previews/CreateSiteUseCaseTest.kt#L73
• SiteCreationStep unknown step issue: https://github.com/wordpress-mobile/WordPress-Android/blob/feature/master-site-creation/WordPress/src/main/java/org/wordpress/android/ui/sitecreation/SiteCreationStep.kt#L16
• NewSiteCreationMainVM receiving steps from Firebase issue: https://github.com/wordpress-mobile/WordPress-Android/blob/feature/master-site-creation/WordPress/src/main/java/org/wordpress/android/ui/sitecreation/NewSiteCreationMainVM.kt#L27
• NewSiteCreationServiceManagerListener injectable AppLog issue which has it's own Github issue Injectable AppLog #8817: https://github.com/wordpress-mobile/WordPress-Android/blob/feature/master-site-creation/WordPress/src/main/java/org/wordpress/android/ui/sitecreation/services/NewSiteCreationServiceManager.kt#L148-L155

[oguzkocer]

All todos has been addressed in #9112, #9114, #9119, #9121.