Chore/Update issue templates and add new tools (#4687)

* Enhancement: Update issue templates and add new tools

- Updated bug report template to include a default label of 'bug'.
- Updated feature request template to include a default label of 'enhancement'.
- Added new credential class for Agentflow API.
- Enhanced Agent and HTTP nodes to improve tool management and error handling.
- Added deprecation badges to several agent and chain classes.
- Introduced new tools for handling requests (GET, POST, DELETE, PUT) with improved error handling.
- Added new chatflows and agentflows for various use cases, including document QnA and translation.
- Updated UI components for better handling of agent flows and marketplace interactions.
- Refactored utility functions for improved functionality and clarity.

* Refactor: Remove beta badge and streamline template title assignment

- Removed the 'BETA' badge from the ExtractMetadataRetriever class.
- Simplified the title assignment in the agentflowv2 generator by using a variable instead of inline string manipulation.

packages/ui/src/ui-component/markdown/Markdown.css

@@ -19,3 +19,45 @@
     border-width: 1px !important;
     padding: 10px !important;
 }
+
+.react-markdown h1,
+.react-markdown h2,
+.react-markdown h3,
+.react-markdown h4,
+.react-markdown h5,
+.react-markdown h6 {
+    line-height: 1.4;
+    margin: 0.8em 0 0.4em 0;
+    font-weight: 600;
+}
+
+.react-markdown h1 {
+    font-size: 1.8em;
+}
+
+.react-markdown h2 {
+    font-size: 1.5em;
+}
+
+.react-markdown h3 {
+    font-size: 1.3em;
+}
+
+.react-markdown h4 {
+    font-size: 1.1em;
+}
+
+.react-markdown h5 {
+    font-size: 1em;
+    font-weight: 700;
+}
+
+.react-markdown h6 {
+    font-size: 0.9em;
+    font-weight: 700;
+}
+
+.react-markdown p {
+    line-height: 1.6;
+    margin: 0.5em 0;
+}