Standardize Ajax requests in portal

• Type: Epic
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: None
• Component/s: Frontend Infrastructure
• Labels:
  • fc_19_07
  • fi-s03e02
  • fi-s03e03
  • fi-s03e04
  • fi-s03e05
  • fi-s03e06
  • fi-s03e07
  • fi-s03e08
  • fi-s03e09
  • fi_test_not_needed
• Epic/Theme:
  • FI_Technical_Debt
• Epic Status: To Do

We should use `Liferay.Util.fetch()` everywhere, opening one task per module.

Currently, we have 120 uses of vanilla JS `fetch` and 99 uses of AUI `A.io.request`.