Improve WikiPageDisplay cache usages

• Type: Story
• Status: Closed
• Priority: Trivial
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: Performance > Caching Infrastructure
• Labels: None
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/55669

Improve WikiPageDisplay cache usages.

The state of the cache in WikiCacheHelper is poorly maintained. It is often completely cleared multiple times (instead of just once) and is cleared in locations that make it difficult to understand why it needs to be cleared. There are also issues with the cache key generation and thread local usage.

This ticket will resolve these problems and more centralize where the cache's state is maintained into wiki-service.