[Chat] load latest conversation (#11396)

* Add load latest conversation

Signed-off-by: Lin Wang <wonglam@amazon.com>

* Changeset file for PR #11396 created/updated

* Address PR comments

Signed-off-by: Lin Wang <wonglam@amazon.com>

* Fix unit tests

Signed-off-by: Lin Wang <wonglam@amazon.com>

* Abort conversation loading after go back

Signed-off-by: Lin Wang <wonglam@amazon.com>

* Change to page 0

Signed-off-by: Lin Wang <wonglam@amazon.com>

* Increase left padding to 12px

Signed-off-by: Lin Wang <wonglam@amazon.com>

* Only pass toolMessage if not include full messages

Signed-off-by: Lin Wang <wonglam@amazon.com>

* Abort loading after show history clicked

Signed-off-by: Lin Wang <wonglam@amazon.com>

---------

Signed-off-by: Lin Wang <wonglam@amazon.com>
Co-authored-by: opensearch-changeset-bot[bot] <154024398+opensearch-changeset-bot[bot]@users.noreply.github.com>

Author: wanglam

changelogs/fragments/11396.yml

@@ -0,0 +1,2 @@
+feat:
+- [Chat] load latest conversation ([#11396](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/11396))

src/plugins/chat/public/components/chat_container.scss

@@ -9,7 +9,7 @@
     "confirmation"
     "screenshot"
     "input";
-  padding: 0 8px 8px 0;
+  padding: 0 8px 8px 12px;
 
   &--fullscreen {
     padding: 0 8px 8px;

src/plugins/chat/public/components/chat_header_button.scss

@@ -35,7 +35,6 @@
   &__content {
     height: 100%;
     box-sizing: border-box;
-    padding-left: $euiSizeS;
   }
 
   &__button {