Speed up building share indicators

[exalate-issue-sync]

Description

The share indicators currently block loading the view for a pretty long time. Needs to be improved.

User Stories

• As a user I want file listings to load as fast as possible, so that I can fulfill my tasks quickly.

Value

Speedy UI.

Acceptance Criteria

• setting share indicators in the store should not cause re-rendering of the entire files table (at the moment it sets the entire files state in the store again instead of modifying individual files in the list)
• share indicators only need the share types of parent nodes, not the exact list of shares (payload is just a few integers instead of a potentially large list of shares). At the moment we build a shares tree in the store which contains much more information than needed. A propfind with depth=0 on all parent nodes would be sufficient.

Definition of done

• Functional requirements
  [ ] functionality described in the user story works
  [ ] acceptance criteria are fulfilled
• Quality
  [ ] codre review happened
  [ ] CI is green
  [ ] critical code received unit tests by the developer
  [ ] automated tests passed (if automated tests are not available, this test needs to be created and passed
• Non-functional requirements
  [ ] no sonar cloud issues