Update PR/issue templates (#2638)

Author: pavolloffay

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -15,7 +15,6 @@ body:
       description: Which component(s) does your bug report concern?
       multiple: true
       options:
-      - operator
       - collector
       - instrumentation
       - target allocator

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -9,7 +9,6 @@ body:
       description: Which component(s) does your feature request concern?
       multiple: true
       options:
-      - operator
       - collector
       - instrumentation
       - target allocator

.github/ISSUE_TEMPLATE/other.yaml

@@ -9,7 +9,6 @@ body:
       description: Which component(s) does your issue concern?
       multiple: true
       options:
-      - operator
       - collector
       - instrumentation
       - target allocator

.github/pull_request_template.md

@@ -2,7 +2,9 @@
 <!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
 Ex. Adding a feature - Explain what this achieves.-->
 
-**Link to tracking Issue:** <Issue number if applicable>
+**Link to tracking Issue(s):** <Issue number if applicable>
+
+- Resolves: #issue-number
 
 **Testing:** <Describe what testing was performed and which tests were added.>