This commit modifies the linkifier-edit modal to use newly added
edit_fields_modal framework.
One important change is that we remove the "edit-linkifier-status"
element as the corresponding "edit-fields-modal-status" element
is added in edit_fields_modal.hbs and we also modify the css
accordingly. This "edit-fields-modal-status" is used only for
this modal and remains empty for others, so this change does not
cause problems with other modals.
There is another element which uses "edit-linkifier-status" as a
class, but the css we defined was for "edit-linkifier-status" as
id, so the css change is also safe.
A modal is added to edit the realm linkifier which
supports ui_report error.
Puppeteer tests to verify linkifier update and an
invalid test to verify that linkifier error messages
are reported on the modal are added as well.