[app] Rework "useDimensions" hook

[ricoberger]

We changed the "useDimensions" hook, so that the hook now also takes
into account when the sidebar is toggled. Before the rework the returned
height and width of the "useDimensions" hook was not changed when a user
opens/closes the sidebar, so that some components where not correctly
adjusted. This is now fixed by using the "getResizeObserver" from the
"@patternfly/react-charts" package within the hook.

• I added a CHANGELOG entry for this change.
• I adjusted the corresponding documentation for this change.
• I adjusted the values.yaml file and the documentation for all values.

[codecov-commenter]

Codecov Report

Merging #422 (1529ccf) into main (d89ca1e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #422   +/-   ##
=======================================
  Coverage   45.61%   45.61%           
=======================================
  Files         139      139           
  Lines       11892    11892           
=======================================
  Hits         5425     5425           
  Misses       6328     6328           
  Partials      139      139           

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