Migrate to using issue type bug instead of label bug. (#6595)

Author: moonbox3

.github/ISSUE_TEMPLATE/dotnet-issue.yml

@@ -1,7 +1,7 @@
 name: .NET Bug Report
 description: Report a bug in the Agent Framework .NET SDK
 title: ".NET: [Bug]: "
-labels: ["bug", ".NET"]
+labels: [".NET"]
 type: bug
 body:
   - type: textarea

.github/ISSUE_TEMPLATE/python-issue.yml

@@ -1,7 +1,7 @@
 name: Python Bug Report
 description: Report a bug in the Agent Framework Python SDK
 title: "Python: [Bug]: "
-labels: ["bug", "Python"]
+labels: ["Python"]
 type: bug
 body:
   - type: textarea

.github/workflows/label-issues.yml

@@ -90,9 +90,7 @@ jobs:
             // Check for issue type from issue form dropdown
             const issueTypeField = getFormFieldValue(body, 'Type of Issue')
             if (issueTypeField) {
-              if (issueTypeField === 'Bug') {
-                labels.push("bug")
-              } else if (issueTypeField === 'Feature Request') {
+              if (issueTypeField === 'Feature Request') {
                 labels.push("enhancement")
               } else if (issueTypeField === 'Question') {
                 labels.push("question")