refactors sharepoint lists collection by:
- renaming `Collection` interface as `preFetchCollection` interface
- making `finishPopulation` method as independent function
- seralizing list using `serializeContent` function
#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🧹 Tech Debt/Cleanup
#### Issue(s)
#4754
#### Test Plan
<!-- How will this be tested prior to merging.-->
- [x] 💪 Manual
- [x] ⚡ Unit test
- [x] 💚 E2E