[ENHANCEMENT] Revisit how to get messages with no locale fallback mechanism

Is your feature request related to a problem? Please describe.
Currently, getting messages without applying a locale fallback mechanism is achieved by passing null to ComponentService.getMessages(null) which calls ComponentService.createCacheItem(null). It has been brought up that using null here can be counterintuitive/obscure.

Describe the solution you'd like
Pass a boolean useLocaleFallback instead.

Describe alternatives you've considered
Pass an empty fallbackLocalesIter.

Additional context
Getting messages without applying a locale fallback mechanism is necessary in ProductService.getAllComponentTranslation. In there, the list of supported locales is first retrieved, then used to get the messages. However, in case of incorrect locale list from the data source where a locale is in the list but messages are not in the data source, we do not want to apply a fallback mechanism.