TableNG: Footer enhancements (#102948)

* Table: Footer support for multiple reducers

* fix migrator test output due to required default value

* fix go migration test

* more go test fixes

* fix go tests for footer

* Merge #110062

* update migration dashboard

* Small docs fixes

* Small docs fix

* remove migration method in Go, update js unit test

* add migration dashboard for footer and clean up some issues with countAll

* Footer should always use og rows for calcs

* update footer to be unaffected by filtering and sorting

* more e2es

* add more complex footer to kitchen sink, migrate panel all the way up

* update codeowners for e2e

* relocate footer migration panels and e2es to main 12.2 migration dashboard

* go further with the migration; kill unused fields, rename reducer to reducers

* get the go code up to date, move enablePagination to its own option as well

* add a unit to one of the numeric columns with a footer in kitchen sink

* fix reducers override in kitchen sink migration table

---------

Co-authored-by: Paul Marbach <paul.marbach@grafana.com>
Co-authored-by: Isabel Matwawana <isabel.matwawana@grafana.com>
Co-authored-by: Isabel Matwawana <76437239+imatwawana@users.noreply.github.com>
Co-authored-by: Leon Sorokin <leeoniya@gmail.com>

.github/CODEOWNERS

@@ -462,6 +462,7 @@
 /e2e-playwright/panels-suite/panelEdit_base.spec.ts @grafana/dashboards-squad
 /e2e-playwright/panels-suite/panelEdit_queries.spec.ts @grafana/dashboards-squad
 /e2e-playwright/panels-suite/panelEdit_transforms.spec.ts @grafana/datapro
+/e2e-playwright/panels-suite/table-footer.spec.ts @grafana/dataviz-squad
 /e2e-playwright/panels-suite/table-kitchenSink.spec.ts @grafana/dataviz-squad
 /e2e-playwright/panels-suite/table-markdown.spec.ts @grafana/dataviz-squad
 /e2e-playwright/panels-suite/table-sparkline.spec.ts @grafana/dataviz-squad