Update bug.yml (#31947)

- Add an "Infrastructure" option for issues related to CICD, github etc.
- Set the default for priorities to priority 2 as implied by the text already. (I could not find the docs for this but found an example here: https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository)

.github/ISSUE_TEMPLATE/bug.yml

@@ -50,6 +50,7 @@ body:
         - "Priority: 2 (default / most bugs should be filed as P2)"
         - "Priority: 1 (data loss / total loss of function)"
         - "Priority: 0 (outage / urgent vulnerability)"
+      default: 1
     validations:
       required: true
   - type: checkboxes
@@ -68,6 +69,7 @@ body:
        - label: "Component: Beam playground"
        - label: "Component: Beam katas"
        - label: "Component: Website"
+       - label: "Component: Infrastructure"
        - label: "Component: Spark Runner"
        - label: "Component: Flink Runner"
        - label: "Component: Samza Runner"