fix: remove unnecessary events to re-render Header Grouping

[ghiscoding]

• Header Grouping is requiring us to subscribe to a few events in order to make sure that the Header Grouping are always rendered properly and that they follow the total width of all columns that are contained in each of the header group. However the grid.onRendered is already being called in many use cases, so there's no need to subscribe to so many events when we know that the onRendered will be called anyway, so we can get rid of many of these events that was duplicating the work (and slightly bad for perf)
• for example onColumnsResized, onColumnsReordered, onColumnPickerColumnsChanged, .... will all trigger the onRendered, so there's really no need to duplicate the work when we can subscribe to a lot less events to do the same work
• tested locally by trying to cover all these use case via the UI

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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 (5ee077d) to head (ce02f0f). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1702 +/- ## ======================================== - Coverage 99.8% 99.8% -0.0% ======================================== Files 187 187 Lines 31108 31094 -14 Branches 9764 9757 -7 ======================================== - Hits 31019 31005 -14 Misses 89 89 ```

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