Fix rowSelectionController for multiple tables

[mawinter69]

when there are 2 or more tables with a rowSelectionController, then it is not possible to update the icon of the first table by calling window.updateTableHeaderCheckbox
Replace by reacting to a custom event sent to the dropdown

Testing done

Tested with jenkinsci/agent-maintenance-plugin#213

Proposed changelog entries

• Fix rowSelectionController for multiple tables

Proposed upgrade guidelines

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