This commit removes the "Remove" and "Unsubscribe" action buttons from
various tables and replaces them with icon buttons using the "close"
icon.
Additionally, previously the rows with and without a remove button had
different heights. This commit updates the fixed `px` values to `em`
units to ensure equal height for all rows, regardless of whether a
remove-subscription button is present.
Fixes: #34874.
ec60c8a70c