Add Secondary Action to confirm_via_gl_modal

What does this MR do and why?

This MR is the first part of solving: #352013 (closed)

It adds support for a secondary Button to the shared confirm_via_gl_modal component.

Screenshots or screen recordings

before	after

How to set up and validate locally

diff --git a/app/assets/javascripts/notes/components/noteable_note.vue b/app/assets/javascripts/notes/components/noteable_note.vue
index eec6b9ba542..7ae741047fa 100644
--- a/app/assets/javascripts/notes/components/noteable_note.vue
+++ b/app/assets/javascripts/notes/components/noteable_note.vue
@@ -357,7 +357,14 @@ export default {
     }) {
       if (shouldConfirm && isDirty) {
         const msg = __('Are you sure you want to cancel editing this comment?');
-        const confirmed = await confirmAction(msg);
+        const confirmed = await confirmAction(msg, {
+          primaryBtnText: __('Cancel Editing'),
+          primaryBtnVariant: 'danger',
+          secondaryBtnVariant: 'confirm',
+          secondaryBtnText: __('Continue Editing'),
+          hideCancel: true,
+        });
         if (!confirmed) return;
       }
       this.$refs.noteBody.resetAutoSave();

1. apply this diff
2. Open a Merge Request
3. write and save a comment
4. edit comment
5. cancel edit of comment
6. see modal in action

MR acceptance checklist

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