gitlab_template: Remove duplicate entry and remove mention of IRC

Part of: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6220

.gitlab/issue_templates/Bug.md

@@ -4,7 +4,7 @@
 <!-- For any GStreamer usage questions or application development support
      please head over to our new GStreamer Discourse forum at
      https://discourse.gstreamer.org/ instead, or find us on
-     the #gstreamer IRC channel on https://www.oftc.net -->
+     the GStreamer Matrix room at https://matrix.to/#/#gstreamer:gstreamer.org -->
 
 #### Expected Behavior
 <!-- What did you expect to happen -->

.gitlab/issue_templates/Question.md

@@ -1,4 +1,5 @@
 For any GStreamer usage questions or application development support
 please head over to our new GStreamer Discourse forum at
 https://discourse.gstreamer.org instead, or find us on the
-`#gstreamer` IRC channel on the OFTC IRC network (https://www.oftc.net).
+GStreamer Matrix room at https://matrix.to/#/#gstreamer:gstreamer.org
+

subprojects/gstreamer/.gitlab/issue_templates/Bug.md

@@ -1,32 +0,0 @@
-### Describe your issue
-<!-- a clear and concise summary of the bug. -->
-<!-- For any GStreamer usage question, please contact the community using the #gstreamer channel on IRC https://www.oftc.net/ or the mailing list on https://gstreamer.freedesktop.org/lists/ -->
-
-#### Expected Behavior
-<!-- What did you expect to happen -->
-
-#### Observed Behavior
-<!-- What actually happened -->
-
-#### Setup
-- **Operating System:**
-- **Device:** Computer / Tablet / Mobile / Virtual Machine <!-- Delete as appropriate !-->
-- **GStreamer Version:**
-- **Command line:**
-
-### Steps to reproduce the bug
-<!-- please fill in exact steps which reproduce the bug on your system, for example: -->
-1. open terminal
-2. type `command`
-
-### How reproducible is the bug?
-<!-- The reproducibility of the bug is Always/Intermittent/Only once after doing a very specific set of steps-->
-
-### Screenshots if relevant
-
-### Solutions you have tried
-
-### Related non-duplicate issues
-
-### Additional Information
-<!-- Any other information such as logs. Make use of <details> for long output -->