chore: Templates update [Up port] (#3483)

Hey, after some talk with @EmandM we decided on Issue Template
modification which includes

- Restricting our GitHub Issues to only **Bugs** and **Feature
requests** while redirecting all other topics (support, feedback and
other issues) to Unity Discussions forum since those topics will get
faster answer there (both from us and active users)
- Removal of mentioned templates that we want to redirect
- Addition of Netcode Topology question for bug reports which was
pointed to be the first question to ask

## Backport
Note that this configuration is taken from the default branch
(#3482)
which currently is `develop`. Porting those to `develop-2.0.0` aims for
having the parity when we will switch the default branch

Author: michalChrobot

.github/ISSUE_TEMPLATE/bug_report.md

@@ -36,6 +36,7 @@ If applicable, add screenshots to help explain your problem.
 - Unity Version: [e.g. 2020.3]
 - Netcode Version: [e.g. 1.0.0-pre.6]
 - Netcode Commit: [e.g. https://github.com/Unity-Technologies/com.unity.netcode.gameobjects/commit/ba418fa5b600ad9eb61fab0575f12fbecc2c6520]
+- Netcode Topology: [e.g. Client-Server, Distributed Authority, etc.]
 
 ### Additional Context
 

.github/ISSUE_TEMPLATE/config.yml

@@ -1,4 +1,4 @@
-blank_issues_enabled: True
+blank_issues_enabled: False
 contact_links:
   - name: Documentation Issues
     url: https://github.com/Unity-Technologies/com.unity.multiplayer.docs/issues
@@ -8,4 +8,10 @@ contact_links:
     about: Join our Discord community for questions, support and discussions
   - name: Unity Multiplayer Forum
     url: https://forum.unity.com/forums/multiplayer.26/
-    about: Create a thread in the Unity Multiplayer Forum
+    about: Create a thread in the Unity Multiplayer Forum
+  - name: Support
+    url: https://discussions.unity.com/tag/netcode-for-gameobjects
+    about: Creating a thread in discussions is usually the fastest way to get help from Unity stuff or other experienced users
+  - name: Feedback
+    url: https://discussions.unity.com/tag/netcode-for-gameobjects
+    about: We are always looking for feedback on our products, so please let us know what you think