feat(modal): mount/unmount on open change (#19531)

* feat(modal): add presence

* feat(modal): fix imports

* feat(modal): remove leftover hook

* feat(modal): fix typo

* feat(modal): move story

* feat(modal): disable presence

* feat(ComposedModal): add support for uncontrolled composed modal

* chore(ComposedModal): add storybook documentation

* fix(usePresence): fix linting

* fix(Modal): fix stories

* docs(enable-presence): add to feature flag overview page

* chore(test): update snapshots

---------

Co-authored-by: Heloise Lui <71858203+heloiselui@users.noreply.github.com>
Co-authored-by: Taylor Jones <tay1orjones@users.noreply.github.com>
Co-authored-by: Taylor Jones <taylor.jones826@gmail.com>
Co-authored-by: ariellalgilmore <ariellalgilmore@gmail.com>

Author: 4 people

packages/feature-flags/feature-flags.yml

@@ -64,3 +64,7 @@ feature-flags:
       richer callback data and expanded trigger events for onChange and
       onDelete.
     enabled: false
+  - name: enable-presence
+    description: >
+      Enable components to remain unmounted in closed state and mount in open state.
+    enabled: false

packages/react/__tests__/__snapshots__/PublicAPI-test.js.snap

@@ -1666,6 +1666,7 @@ Map {
     },
     "render": [Function],
   },
+  "ComposedModalPresence" => {},
   "ContainedList" => {
     "ContainedListItem": {
       "propTypes": {
@@ -6741,6 +6742,7 @@ Map {
     },
     "render": [Function],
   },
+  "ModalPresence" => {},
   "ModalWrapper" => {
     "propTypes": {
       "buttonTriggerClassName": {

packages/react/src/__tests__/index-test.js

@@ -49,6 +49,7 @@ describe('Carbon Components React', () => {
         "ComboBox",
         "ComboButton",
         "ComposedModal",
+        "ComposedModalPresence",
         "ContainedList",
         "ContainedListItem",
         "Content",
@@ -147,6 +148,7 @@ describe('Carbon Components React', () => {
         "ModalBody",
         "ModalFooter",
         "ModalHeader",
+        "ModalPresence",
         "ModalWrapper",
         "MultiSelect",
         "NotificationActionButton",