chore: move Infinite Scroll logic to vanilla component

[ghiscoding]

• as per this comment suggestion, the Infinite Scroll logic shouldn't be in any Backend Services, it should rather be moved to the vanilla component (for other repos, that would be within Angular-Slickgrid, ...)

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.8%. Comparing base (76affce) to head (e2d1ddc).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1632 +/- ## ======================================== - Coverage 99.8% 99.8% -0.0% ======================================== Files 198 198 Lines 21878 21859 -19 Branches 7174 7027 -147 ======================================== - Hits 21817 21796 -21 - Misses 55 63 +8 + Partials 6 0 -6 ```

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