make pf5 and pf6 versions similar to reduce conflicts when backporting features

[jgbernalp]

This set of changes will allow to backport features with ease reducing conflicts:

• Sync 0.4 with 0.5, as not all the changes were cherry-picked to both streams: NO-JIRA: Sync 0.4 with 0.5 #463
• Remove incidents from 0.4 as is only supported from 4.19+: NO-JIRA: Sync 0.4 with 0.5 #463
• Convert incident pages to TypeScript: NO-JIRA: refactor incidents to add typescript #475
• Create component wrappers that will implement internally PF5 and PF6 variants