FEATURE: Promote bookmarks with reminders to core functionality (#9369)

The main thrust of this PR is to take all the conditional checks based on the `enable_bookmarks_with_reminders` away and only keep the code from the `true` path, making bookmarks with reminders the core bookmarks feature. There is also a migration to create `Bookmark` records out of `PostAction` bookmarks for a site.

### Summary

* Remove logic based on whether enable_bookmarks_with_reminders is true. This site setting is now obsolete, the old bookmark functionality is being removed. Retain the setting and set the value to `true` in a migration.
* Use the code from the rake task to create a database migration that creates bookmarks from post actions.
* Change the bookmark report to read from the new table.
* Get rid of old endpoints for bookmarks
* Link to the new bookmarks list from the user summary page

test/javascripts/widgets/post-test.js

@@ -532,19 +532,19 @@ widgetTest("can't bookmark", {
 
 widgetTest("bookmark", {
   template:
-    '{{mount-widget widget="post" args=args toggleBookmark=(action "toggleBookmark")}}',
+    '{{mount-widget widget="post" args=args toggleBookmarkWithReminder=(action "toggleBookmarkWithReminder")}}',
   beforeEach() {
     const args = { canBookmark: true };
 
     this.set("args", args);
-    this.on("toggleBookmark", () => (args.bookmarked = true));
+    this.on(
+      "toggleBookmarkWithReminder",
+      () => (args.bookmarked_with_reminder = true)
+    );
   },
   async test(assert) {
     assert.equal(find(".post-menu-area .bookmark").length, 1);
     assert.equal(find("button.bookmarked").length, 0);
-
-    await click("button.bookmark");
-    assert.equal(find("button.bookmarked").length, 1);
   }
 });
 

test/javascripts/widgets/user-menu-test.js

@@ -145,11 +145,9 @@ widgetTest("bookmarks", {
     const bookmark = find(".quick-access-panel li a")[0];
     assert.ok(bookmark);
 
+    assert.ok(bookmark.href.includes("/t/yelling-topic-title/119"));
     assert.ok(
-      bookmark.href.includes("/t/how-to-check-the-user-level-via-ajax/11993")
-    );
-    assert.ok(
-      bookmark.innerHTML.includes("Abhishek_Gupta"),
+      bookmark.innerHTML.includes("someguy"),
       "should include the last poster's username"
     );
     assert.ok(